Oieffur fantasy dildos are available in 4 to 6 size tiers per product, each individually measured for total length, usable (insertable) length, and maximum diameter. All dimensions are in centimeters. Weights are in grams.

Because platinum-cured silicone firmness changes with diameter — a 4cm shaft in Shore 00-20 silicone feels noticeably softer than the same material at 7cm — size selection affects more than just fit. It affects sensation.

Every size-and-product combination is mapped on Oieffur's proprietary Sensory Firmness Scale, a 4-level system that translates Shore hardness ratings into real-world tactile comparisons (ripe avocado, tomato, eggplant, cucumber). This guide provides exact measurements, explains how we measure, and offers a simple method for choosing your first size with confidence.

Three numbers define every size tier. Here is what each one means.

Total Length — tip to base, including any non-insertable base structure (suction cup, scrotum base, vine base). This is the number you compare to the palm of your hand for a quick sense of overall scale.

Usable Length — the insertable portion only, measured from the tip to where the base begins. This is the number that matters for depth.

Max Diameter — the widest point of the shaft, measured across the thickest cross-section. For knotted designs (Fenrahl), the knot diameter is listed separately from the shaft diameter.

Hand test: make a circle with your thumb and index finger matching the max diameter. That ring is the widest moment during use. If it feels like a stretch in your hand, it will feel like a stretch elsewhere. When in doubt, start smaller.

Split tip entry, graduated sensory nodes, organic vine texture. Single-density platinum silicone.

Node count: 3-4 depending on size. Diameter increase per node: ~2-3mm. Spacing: ~15mm center-to-center. Tip spread: ~12mm at widest fork.

View Nagaros product page →

Horse-form head with crown ridge, nodule bumps, dense vascular texture. Dual-density platinum silicone with realistic scrotum base.

Note: Strong Bow is a dual-density design — soft outer layer over firm inner core. The firmness feel is different from single-density products at the same Shore rating.

View Strong Bow product page →

Tapered canine shaft with bulbous knot, marble vein texture. Dual-density platinum silicone with fur/paw base.

Note: Fenrahl has two diameter measurements — shaft and knot. The knot is the widest point and defines the "lock" sensation. If you are new to knotted designs, compare the knot diameter to your hand circle, not the shaft diameter.

[View Fenrahl product page →] (link pending — product not yet listed)

If you are new to fantasy toys, or new to Oieffur, here is a simple framework.

Start one size smaller than you think you need. Platinum silicone has almost no give compared to TPE or jelly. A "medium" in platinum silicone will feel larger than a "medium" in softer materials you may have used before.

Think about diameter, not length. Length is easy to manage — you control depth. Diameter is what your body adapts to. If the max diameter feels comfortable in your hand circle test, it will likely work. If it feels tight, go down one size.

Consider the design.

Use the Sensory Firmness Scale. Diameter changes how firmness feels. A smaller piece in the same silicone feels firmer. A larger piece in the same silicone feels softer. The Scale maps every size-product combination to a 4-level tactile rating so there are no surprises.

Silicone firmness is not fixed. It depends on two things: the Shore hardness of the material, and the diameter of the piece.

The same platinum silicone (Shore 00-20) poured at 3cm diameter feels firm — close to squeezing a dry bar of soap. At 6cm diameter, the same material feels softer — closer to pressing a ripe tomato. The material did not change. The geometry did.

This is why we built the Sensory Firmness Scale. It maps Shore hardness x diameter to a 4-level system:

When choosing a size, check where your target size falls on the Scale. If you want a softer feel, go larger. If you want firmer, go smaller. Same product, same silicone, different experience.

What if I pick the wrong size?

Contact us within 14 days if the product is unused and in original packaging. We will work with you on sizing. We would rather help you find the right fit than lose you to a bad first experience.

Do your sizes run large or small compared to other brands?

There is no industry standard for fantasy toy sizing. Our measurements are exact — total length, usable length, max diameter in centimeters. Compare these numbers directly to any product you already own rather than comparing size labels (S/M/L vary by brand).

Should I size up or down for anal use?

Down. Anal tissue is less elastic than vaginal tissue and requires more gradual adaptation. Start at least one size smaller than you would for vaginal use, and always use generous water-based lubricant.

Can I use silicone lubricant with these products?

We recommend water-based lubricant only. While platinum-cured silicone is generally compatible with silicone lubricant (unlike cheaper silicones), we recommend water-based to avoid any risk of surface degradation over time. See our Care Guide for full lubricant compatibility details.

What does "dual-density" mean for sizing?

Dual-density products (Strong Bow, Fenrahl) have a soft outer layer over a firm inner core. At the same diameter, a dual-density piece feels slightly softer to the touch than a single-density piece (Nagaros) because your fingers compress the outer layer first. The inner core provides structure during use. This means dual-density products are slightly more forgiving at larger sizes.