SSND-MRB 16-21
Recommended for open bore options
The SSND-MRB 16-21 is one of our largest sounds, with a full 13" insertable length and 14 rounded bumps that gradually expand from 16.6mm at the tip to about 21mm near the base.
Details
- Insertable length: 13" (330 mm)
- Tip bump: 16.6 mm (50 Fr)
- 14 progressive bumps, gradually expanding toward the base
- Base flange: 21.1 mm (63.3 Fr)
Bump & valley table
| Segment | Peak diameter | Valley |
|---|---|---|
| Tip | 16.6 mm (50 Fr) | 11.5 mm (34.5 Fr) |
| Bump 2 | 16.8 mm (50.5 Fr) | 10.9 mm (32.7 Fr) |
| Bump 3 | 17.0 mm (51 Fr) | 12.6 mm (37.8 Fr) |
| Bump 4 | 17.7 mm (53 Fr) | 13.3 mm (40 Fr) |
| Bump 5 | 18.4 mm (55 Fr) | 14.1 mm (42 Fr) |
| Bump 6 | 18.9 mm (56.7 Fr) | 16.0 mm (48 Fr) |
| Bump 7 | 20.2 mm (60.6 Fr) | 16.6 mm (50 Fr) |
| Bump 8 | 20.6 mm (61.8 Fr) | 16.6 mm (50 Fr) |
| Bump 9 | 20.7 mm (62 Fr) | 16.6 mm (50 Fr) |
| Bump 10 | 20.6 mm (61.8 Fr) | 16.1 mm (48.3 Fr) |
| Bump 11 | 20.9 mm (62.7 Fr) | 16.1 mm (48.3 Fr) |
| Bump 12 | 20.6 mm (61.8 Fr) | 16.8 mm (50.4 Fr) |
| Bump 13 | 20.8 mm (62.4 Fr) | 16.7 mm (50.1 Fr) |
| Bump 14 | 20.8 mm (62.4 Fr) | 15.0 mm (45 Fr) |
| Base flange | 21.1 mm (63.3 Fr) | — |
How it works
Each bump gradually increases in size from front to back, so the widest points are near the base rather than the tip. The alternating peaks and valleys let tissue relax between segments while lubricant tracks evenly along the shaft.
Choosing your silicone firmness
Bob recommends #00-50 (Soft) — at this size, it lets the bumps stay highly compressible during insertion while still applying steady outward pressure once in place. Because it's soft and flexible over a 13" length, plan for ample lubrication and a slow, patient pace.
Color options
#18 and #30 are available in pure translucent silicone.
#00-20, #00-50, and #10 use a translucent white base and can be mixed with our standard colors.
Please note
This is one of our largest pieces, reaching up to 21mm over 13" — intended strictly for advanced users with established stretching experience.
Use appropriate lubrication and never force insertion. Stop immediately if you experience pain, bleeding, or significant discomfort. Inspect the sound before each use and do not use it if damaged.