SSND-MRB 7 Rib 10.3-13mm

The SSND-MRB 7 Rib is a 7.75" sound with seven sequential ribs that step up to a 13mm peak at the third rib, then vary slightly down the remaining length.

Details

• Overall length: 7.75" (197 mm)
• Insertable length: 7.0" (178 mm)
• Entry point: 10.3 mm (31 Fr)
• Peak rib (3rd): 13.0 mm (39 Fr)
• Shaft profile range: 10.3–13.0 mm (31–39 Fr)
• Retention valley: 8.8 mm (26.4 Fr)
• Safety flange base: 16.0 mm (0.63")

How it works

The smooth, rounded tip guides initial entry, then seven ribs step through a range of 10.3mm to 13mm, peaking at the third rib for a distinct point of maximum stretch, before settling with subtle variation down the remaining shaft. Past the final rib, the profile narrows into an 8.8mm retention valley, letting the muscle anchor just ahead of the 16mm flared base.

Choosing your silicone firmness

Bob recommends #10 (Medium) as the default — it prevents the shaft from bowing during insertion while transmitting crisp, well-defined tactile feedback along each rib.

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 falls in our intermediate, 12–15mm diameter tier.
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.