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Oieffur guides

Size Guide

Measured circumference, usable length and weight across the current Oieffur range.

Every Oieffur piece is measured by hand before it goes on sale. Not scaled from a CAD file, not estimated from the mould drawing. This guide lists total length, usable length, maximum circumference and weight for all 34 products currently in the shop, across 119 size tiers. All lengths are in centimetres, weights in grams.

Circumference is the number that decides fit, so circumference is what we publish. It is measured with a soft tape wrapped around the thickest point of the shaft. Most sites quote diameter instead, but on a fantasy shape diameter is almost never measured — it is calculated from circumference on the assumption that the cross-section is a perfect circle. Very few of these shapes are. We would rather give you the number we actually took off the piece.


How We Measure

Four numbers define every size tier.

Total Length — tip to base, including any part that does not go in: suction cup, scrotum base, flared plate. This is the number for judging overall scale and for knowing whether it fits in your drawer.

Usable Length — the insertable portion only, tip to where the base begins. This is the number that matters for depth. On some designs it is 4–6 cm shorter than total length; on the sleeves it is shorter still, because the ring and the cuff sit outside.

Max Circumference — a soft tape wrapped around the widest point. On knotted designs the knot is the widest point, so the knot is the number listed. On flared designs it is the head.

Weight — the finished piece on a scale. Worth reading before you buy the largest tier of anything. Several of them pass 2 kg, and a few pass 3.5 kg.

If you want a diameter figure to compare against something you already own, divide the circumference by 3.14. Treat the result as an approximation, for the reason given above.


The Fist Test

You do not need to buy anything to calibrate yourself against these numbers. You already have a reference object.

Take a soft tape measure — the fabric kind for sewing — make a fist, and wrap the tape around your knuckles. Most adult fists come out between 22 and 26 cm. Write that number down. It is the single most useful figure you can bring to this page.

Now read the Max Circumference column against it. Anything approaching your own fist measurement is a serious stretch and not a first purchase. Something 8–10 cm below it is a reasonable place to start.

No tape measure in the house? Three objects most people can find, all close to 21 cm around: a standard soda can, a tennis ball, and the body of a 500 ml water bottle. Hold one and you have a physical sense of what 21 cm means before you order it.


Choosing Your First Size

Go one tier below your instinct. Platinum-cured silicone has far less give than the TPE or jelly material most people have handled before. A tier that looks moderate on screen will read larger in the hand, and larger again in use.

Length is negotiable. Circumference is not. You control how much length you take. You do not control circumference — it arrives all at once, at the widest point, and your body either accommodates it or it does not. If you are deciding between two tiers, decide on the circumference column and let the length fall where it falls.

Read usable length, not total length. The difference between the two is base structure. A 33 cm piece with a 6 cm scrotum base is a 27 cm piece as far as your body is concerned.

Knots and flares move the difficulty. On a knotted or flared design the widest point is not the middle of the shaft — it is one specific moment, at entry or just past it. The rest is easier than the number suggests, and that one moment is harder. If you have not used a knotted design before, start two tiers down rather than one.


Dildos

Abyss Spiked Dildo

5 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
XS17.0 cm15.0 cm12.6 cm158 g
S21.5 cm19.0 cm15.5 cm312 g
M25.0 cm23.0 cm18.0 cm489 g
L29.5 cm26.0 cm20.5 cm788 g
XL32.0 cm28.3 cm23.6 cm1125 g

View Abyss Spiked Dildo →

Abyssal Depths Beaded Dildo

3 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
XS13.0 cm11.7 cm12.8 cm94 g
S18.5 cm17.0 cm19.0 cm309 g
M24.5 cm22.0 cm25.0 cm672 g

View Abyssal Depths Beaded Dildo →

Centaur Horse Dildo

3 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
S22.0 cm19.3 cm19.5 cm605 g
M27.0 cm22.5 cm24.0 cm1086 g
L33.5 cm28.0 cm29.0 cm2016 g

View Centaur Horse Dildo →

Dual Sensation Double-Ended Horse Dildo

One size.

SizeTotal LengthUsable LengthMax CircumferenceWeight
One size30.5 cm24.0 cm15.0 cm385 g

View Dual Sensation Double-Ended Horse Dildo →

Firewolf Wolf and Dog Knot Dildo

4 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
S19.3 cm17.8 cm18.5 cm328 g
M24.0 cm22.2 cm22.5 cm633 g
L27.5 cm25.5 cm26.5 cm950 g
XL33.0 cm29.5 cm32.0 cm1645 g

View Firewolf Wolf and Dog Knot Dildo →

Hermavex Multi Cock Tapered Dildo

3 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
S30.6 cm28.7 cm19.7 cm830 g
M36.9 cm34.4 cm24.5 cm1468 g
L43.8 cm41.5 cm29.0 cm2247 g

View Hermavex Multi Cock Tapered Dildo →

Horse Spirit Horse Dildo

5 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
S22.0 cm16.5 cm19.0 cm580 g
M26.8 cm19.9 cm23.0 cm1032 g
L32.5 cm24.2 cm28.0 cm1844 g
XL36.5 cm28.3 cm32.0 cm2656 g
XXL40.6 cm31.3 cm38.0 cm3720 g

View Horse Spirit Horse Dildo →

Hot Surge Realistic Dildo

4 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
XS16.8 cm11.2 cm12.0 cm218 g
S23.5 cm16.2 cm17.3 cm560 g
M31.0 cm23.0 cm21.5 cm1257 g
L35.5 cm27.5 cm26.0 cm2058 g

View Hot Surge Realistic Dildo →

Koopa Monster Dildo

3 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
S21.5 cm17.3 cm16.3 cm372 g
M27.3 cm23.0 cm21.5 cm872 g
L32.0 cm27.3 cm26.0 cm1517 g

View Koopa Monster Dildo →

Nagaros Naga Dildo

4 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
S22.2 cm19.5 cm17.5 cm317 g
M27.0 cm24.0 cm21.5 cm592 g
L31.5 cm26.5 cm25.0 cm949 g
XL35.5 cm30.0 cm27.8 cm1342 g

View Nagaros Naga Dildo →

Nexus Node Alien Monster Dildo

5 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
XS16.3 cm11.3 cm14.6 cm214 g
S20.4 cm14.2 cm18.0 cm401 g
M23.8 cm17.3 cm22.2 cm674 g
L26.9 cm19.8 cm25.0 cm1009 g
XL31.5 cm23.7 cm29.6 cm1657 g

View Nexus Node Alien Monster Dildo →

Red Rock Turtle Dildo

3 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
S17.1 cm16.0 cm19.3 cm234 g
M22.2 cm20.4 cm24.4 cm453 g
L27.1 cm25.1 cm30.0 cm853 g

View Red Rock Turtle Dildo →

Skyline Challenger Squirting Knot Dildo

5 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
XS13.3 cm9.7 cm15.5 cm231 g
S15.6 cm11.0 cm18.0 cm374 g
M18.6 cm13.1 cm21.8 cm625 g
L21.1 cm15.6 cm24.3 cm915 g
XL24.3 cm18.0 cm28.5 cm1434 g

View Skyline Challenger Squirting Knot Dildo →

Stardust Shuttle Beaded Alien Dildo

4 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
S30.5 cm28.2 cm16.3 cm262 g
M37.0 cm33.2 cm20.0 cm479 g
L43.2 cm39.6 cm24.0 cm800 g
XL49.6 cm45.5 cm26.6 cm1136 g

View Stardust Shuttle Beaded Alien Dildo →

Strong Bow Horse Dildo

Dual-density construction — firmer inner core, softer outer layer. 6 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
XS18.9 cm14.5 cm13.2 cm241 g
S22.3 cm18.0 cm16.0 cm450 g
M26.7 cm21.5 cm19.5 cm763 g
L32.0 cm26.0 cm23.0 cm1314 g
XL38.9 cm31.8 cm28.0 cm2284 g
XXL45.5 cm36.5 cm32.5 cm3645 g

View Strong Bow Horse Dildo →

Sword Demon Spiral Suction Cup Dildo

3 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
S15.5 cm13.7 cm15.2 cm222 g
M21.5 cm19.5 cm22.1 cm625 g
L27.0 cm25.3 cm27.3 cm1289 g

View Sword Demon Spiral Suction Cup Dildo →

The Bloom-Parasite Dildo

4 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
S27.6 cm25.5 cm17.0 cm347 g
M34.1 cm31.7 cm21.0 cm673 g
L41.2 cm38.4 cm24.7 cm1209 g
XL46.9 cm44.0 cm30.5 cm1937 g

View The Bloom-Parasite Dildo →

Thick Conqueror Tapered Dildo

5 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
XS11.9 cm10.7 cm10.8 cm72 g
S18.0 cm15.5 cm17.2 cm264 g
M25.0 cm21.5 cm23.5 cm673 g
L32.5 cm29.0 cm30.3 cm1386 g
XL37.5 cm33.5 cm35.5 cm2135 g

View Thick Conqueror Tapered Dildo →

Twin Fantasy Double Ended Tentacle Dildo

3 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
M50.2 cm42.7 cm19.8 cm1529 g
L58.7 cm45.5 cm23.8 cm2509 g
XL68.4 cm56.5 cm28.2 cm3954 g

View Twin Fantasy Double Ended Tentacle Dildo →

Vargrahl Dog Knot Dildo

Dual-density construction — firmer inner core, softer outer layer. 4 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
S18.0 cm14.2 cm13.6 cm250 g
M23.1 cm18.0 cm17.8 cm549 g
L28.9 cm22.9 cm21.9 cm1027 g
XL33.4 cm27.6 cm25.2 cm1593 g

View Vargrahl Dog Knot Dildo →

Vivid Big Head Realistic Dildo

5 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
S19.5 cm14.5 cm15.3 cm458 g
M23.3 cm17.9 cm18.7 cm838 g
L27.5 cm21.0 cm21.3 cm1348 g
XL32.0 cm25.1 cm25.3 cm2089 g
XXL37.5 cm29.4 cm30.8 cm3513 g

View Vivid Big Head Realistic Dildo →

Winding Beaded Snake Dildo

5 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
XS24.5 cm22.1 cm15.7 cm194 g
S28.8 cm26.3 cm18.6 cm316 g
M32.1 cm29.2 cm21.0 cm450 g
L39.0 cm35.7 cm25.0 cm785 g
XL43.0 cm39.0 cm27.3 cm987 g

View Winding Beaded Snake Dildo →


Plugs & Strokers

Fissure Flesh Flower Butt Plug

4 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
XS7.9 cm6.7 cm15.0 cm67 g
S11.0 cm9.8 cm21.0 cm177 g
M14.3 cm12.5 cm26.2 cm359 g
L17.5 cm14.5 cm32.1 cm627 g

View Fissure Flesh Flower Butt Plug →

Milking Fruit II Lion Head Anal Plug

12 size tiers.

Core only

SizeTotal LengthUsable LengthMax CircumferenceWeight
XS10.2 cm7.5 cm11.5 cm40 g
S12.5 cm9.0 cm15.0 cm82 g
M17.5 cm13.0 cm20.5 cm230 g
L23.0 cm16.5 cm26.5 cm477 g

Full set

SizeTotal LengthUsable LengthMax CircumferenceWeight
XS10.2 cm7.5 cm11.5 cm93 g
S12.5 cm9.0 cm15.0 cm188 g
M17.5 cm13.0 cm20.5 cm523 g
L23.0 cm16.5 cm26.5 cm1106 g

Sleeve only

SizeTotal LengthUsable LengthMax CircumferenceWeight
XS8.1 cm6.0 cm6.0 cm53 g
S10.4 cm7.3 cm7.4 cm106 g
M14.6 cm9.8 cm10.3 cm292 g
L18.8 cm13.1 cm13.1 cm629 g

View Milking Fruit II Lion Head Anal Plug →

Mirror Anal Prolapse Toy Plug

Dual-density construction — firmer inner core, softer outer layer. 5 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
XS10.1 cm7.5 cm15.0 cm130 g
S12.8 cm9.9 cm19.0 cm260 g
M15.0 cm11.3 cm23.0 cm438 g
L20.0 cm16.5 cm31.0 cm1075 g
XL23.5 cm19.0 cm36.5 cm1757 g

View Mirror Anal Prolapse Toy Plug →

Shark Egg Spiral Butt Plug

3 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
S12.8 cm11.0 cm17.5 cm141 g
M15.8 cm13.0 cm22.0 cm303 g
L19.3 cm16.0 cm25.0 cm487 g

View Shark Egg Spiral Butt Plug →

Wave Fantasy Anal Plug Toy

3 size tiers.

SizeTotal LengthUsable LengthMax CircumferenceWeight
S7.4 cm5.5 cm10.0 cm48 g
M9.5 cm7.6 cm15.0 cm138 g
L12.0 cm9.0 cm18.2 cm241 g

View Wave Fantasy Anal Plug Toy →


Sleeves

Black Fury Penis Sleeve with Scrotal Pouch

One size.

SizeTotal LengthUsable LengthMax CircumferenceWeight
One size20.0 cm11.3 cm13.3 cm133 g

View Black Fury Penis Sleeve with Scrotal Pouch →

Cyberpunk Sheath Penis Sleeve Extender

One size.

SizeTotal LengthUsable LengthMax CircumferenceWeight
One size21.5 cm13.7 cm15.5 cm233 g

View Cyberpunk Sheath Penis Sleeve Extender →

Dog Penis Sleeve, Canine Cock Sheath

One size.

SizeTotal LengthUsable LengthMax CircumferenceWeight
One size19.5 cm12.5 cm18.0 cm170 g

View Dog Penis Sleeve, Canine Cock Sheath →

Horse Sheath Cock Sleeve

One size.

SizeTotal LengthUsable LengthMax CircumferenceWeight
One size18.5 cm14.2 cm17.3 cm271 g

View Horse Sheath Cock Sleeve →

Lifelike Sleeve Penis Extender

One size.

SizeTotal LengthUsable LengthMax CircumferenceWeight
One size18.9 cm12.0 cm14.0 cm109 g

View Lifelike Sleeve Penis Extender →

Storm Horse Penis Extender Sleeve

One size.

SizeTotal LengthUsable LengthMax CircumferenceWeight
One size20.7 cm12.4 cm15.8 cm166 g

View Storm Horse Penis Extender Sleeve →

Warhorse Horse Penis Sleeve with Ball Ring

One size.

SizeTotal LengthUsable LengthMax CircumferenceWeight
One size20.5 cm13.3 cm15.6 cm148 g

View Warhorse Horse Penis Sleeve with Ball Ring →


Quick Reference: Sorted by Circumference

If you have done the fist test and you know your number, start here instead. Every tier in the shop, grouped by how far around it measures at the widest point.

Under 13 cm

6 products, 10 tiers.

  • Wave Fantasy Anal Plug Toy — S
  • Milking Fruit II Lion Head Anal Plug — Core only XS, Full set XS, Sleeve only XS, Sleeve only S, Sleeve only M
  • Thick Conqueror Tapered Dildo — XS
  • Hot Surge Realistic Dildo — XS
  • Abyss Spiked Dildo — XS
  • Abyssal Depths Beaded Dildo — XS

13 to 18 cm

26 products, 30 tiers.

  • Vargrahl Dog Knot Dildo — S, M
  • The Bloom-Parasite Dildo — S
  • Nagaros Naga Dildo — S
  • Stardust Shuttle Beaded Alien Dildo — S
  • Fissure Flesh Flower Butt Plug — XS
  • Cyberpunk Sheath Penis Sleeve Extender — One size
  • Wave Fantasy Anal Plug Toy — M
  • Winding Beaded Snake Dildo — XS
  • Milking Fruit II Lion Head Anal Plug — Core only S, Full set S, Sleeve only L
  • Nexus Node Alien Monster Dildo — XS
  • Vivid Big Head Realistic Dildo — S
  • Strong Bow Horse Dildo — XS, S
  • Black Fury Penis Sleeve with Scrotal Pouch — One size
  • Storm Horse Penis Extender Sleeve — One size
  • Warhorse Horse Penis Sleeve with Ball Ring — One size
  • Lifelike Sleeve Penis Extender — One size
  • Skyline Challenger Squirting Knot Dildo — XS
  • Mirror Anal Prolapse Toy Plug — XS
  • Dual Sensation Double-Ended Horse Dildo — One size
  • Thick Conqueror Tapered Dildo — S
  • Hot Surge Realistic Dildo — S
  • Horse Sheath Cock Sleeve — One size
  • Shark Egg Spiral Butt Plug — S
  • Koopa Monster Dildo — S
  • Abyss Spiked Dildo — S
  • Sword Demon Spiral Suction Cup Dildo — S

18 to 23 cm

26 products, 33 tiers.

  • Vargrahl Dog Knot Dildo — L
  • Twin Fantasy Double Ended Tentacle Dildo — M
  • The Bloom-Parasite Dildo — M
  • Nagaros Naga Dildo — M
  • Stardust Shuttle Beaded Alien Dildo — M
  • Fissure Flesh Flower Butt Plug — S
  • Wave Fantasy Anal Plug Toy — L
  • Winding Beaded Snake Dildo — S, M
  • Milking Fruit II Lion Head Anal Plug — Core only M, Full set M
  • Nexus Node Alien Monster Dildo — S, M
  • Vivid Big Head Realistic Dildo — M, L
  • Strong Bow Horse Dildo — M
  • Horse Spirit Horse Dildo — S
  • Dog Penis Sleeve, Canine Cock Sheath — One size
  • Skyline Challenger Squirting Knot Dildo — S, M
  • Mirror Anal Prolapse Toy Plug — S
  • Hot Surge Realistic Dildo — M
  • Shark Egg Spiral Butt Plug — M
  • Koopa Monster Dildo — M
  • Abyss Spiked Dildo — M, L
  • Sword Demon Spiral Suction Cup Dildo — M
  • Firewolf Wolf and Dog Knot Dildo — S, M
  • Abyssal Depths Beaded Dildo — S
  • Red Rock Turtle Dildo — S
  • Centaur Horse Dildo — S
  • Hermavex Multi Cock Tapered Dildo — S

23 to 28 cm

25 products, 29 tiers.

  • Vargrahl Dog Knot Dildo — XL
  • Twin Fantasy Double Ended Tentacle Dildo — L
  • The Bloom-Parasite Dildo — L
  • Nagaros Naga Dildo — L, XL
  • Stardust Shuttle Beaded Alien Dildo — L, XL
  • Fissure Flesh Flower Butt Plug — M
  • Winding Beaded Snake Dildo — L, XL
  • Milking Fruit II Lion Head Anal Plug — Core only L, Full set L
  • Nexus Node Alien Monster Dildo — L
  • Vivid Big Head Realistic Dildo — XL
  • Strong Bow Horse Dildo — L
  • Horse Spirit Horse Dildo — M
  • Skyline Challenger Squirting Knot Dildo — L
  • Mirror Anal Prolapse Toy Plug — M
  • Thick Conqueror Tapered Dildo — M
  • Hot Surge Realistic Dildo — L
  • Shark Egg Spiral Butt Plug — L
  • Koopa Monster Dildo — L
  • Abyss Spiked Dildo — XL
  • Sword Demon Spiral Suction Cup Dildo — L
  • Firewolf Wolf and Dog Knot Dildo — L
  • Abyssal Depths Beaded Dildo — M
  • Red Rock Turtle Dildo — M
  • Centaur Horse Dildo — M
  • Hermavex Multi Cock Tapered Dildo — M

Over 28 cm

14 products, 19 tiers.

  • Twin Fantasy Double Ended Tentacle Dildo — XL
  • The Bloom-Parasite Dildo — XL
  • Fissure Flesh Flower Butt Plug — L
  • Nexus Node Alien Monster Dildo — XL
  • Vivid Big Head Realistic Dildo — XXL
  • Strong Bow Horse Dildo — XL, XXL
  • Horse Spirit Horse Dildo — L, XL, XXL
  • Skyline Challenger Squirting Knot Dildo — XL
  • Mirror Anal Prolapse Toy Plug — L, XL
  • Thick Conqueror Tapered Dildo — L, XL
  • Firewolf Wolf and Dog Knot Dildo — XL
  • Centaur Horse Dildo — L
  • Red Rock Turtle Dildo — L
  • Hermavex Multi Cock Tapered Dildo — L

How Accurate Are These Numbers

Less accurate than a table of decimals implies, and we would rather say so than pretend otherwise.

Measuring these shapes is not like measuring a pipe. Two people measuring the same piece get two different numbers. The same person measuring twice on different days gets two different numbers. The shapes are not round — they are oval in places, flattened in others, and they rise and fall along their length. Where exactly you lay the tape changes the reading.

So here is what we actually do, and what the numbers mean. We wrap a soft tape around the widest point and read the circumference. That is the measured value, and it is the one in the table. Where a diameter figure appears on a product page, it was calculated from that circumference, not measured separately — which is also why a diameter derived this way runs slightly large on a shape that is not a true circle.

Treat every figure here as close, not exact. Use them to compare one piece against another, and to compare against your own fist measurement. Do not use them to plan around a difference of a few millimetres, because a few millimetres is inside the noise of the measurement itself.

If something you receive is clearly not what the table says — not a few millimetres, but visibly different — tell us. We want to know.


For material, cleaning and storage, see Materials & Care.