SSND-MRB 7 Rib 11-14mm
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Recommended for open bore options
SSND-MRB 7 Rib 11-14mm features 7 ribs and a specialized mid-shaft expansion designed to deliver targeted internal stimulation. The tapered tip and varying segment geometries build a complex sequence of sensations before settling into a dedicated retention valley.
Available in both solid-core and open-core configurations, the hollow option allows for fluid drainage during extended wear.
Anatomical Sizing & Mechanics
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Tapered Entry Profile: Begins with a 11mm rounded entry tip that leads into a slightly larger second rib to initiate comfortable, gradual sizing.
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Mid-Shaft Peak Rib: Steps up to a maximum peak diameter of 14mm at the third rib segment for noticeable internal focus.
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Graduated Ribbed Shaft: Features three subsequent 13mm ribs that taper down to a 12.5mm seventh rib over a 5-inch spans to vary stimulation along the canal.
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Elongated Retention Valley: Incorporates a 9mm retention groove positioned directly proximal to the base to anchor the piece securely for hold-in-place wear.
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Flared Safety Base: Terminates at a 1/2" (12.7mm) flared flange to serve as a physical stop mechanism for safe positioning and retrieval.
Anatomical Depth Guide
With an insertable shaft length of 7.5" (190mm), the SSND-MRB 7 Rib 11-14mm provides intermediate canal reach, advancing through the penile urethra to access the prostatic region. Operating within the 7"–9" depth range, it delivers full-length stimulation while remaining easily manageable.
Dimension & Sizing Profile
| Segment / Feature | Outer Diameter (mm) | French Sizing (Fr) |
| 1st Rib (Entry Tip) | 11.0mm | 33.0 Fr |
| 2nd Rib | ~12.0mm | ~36.0 Fr |
| 3rd Rib (Peak Diameter) | 14.0mm | 42.0 Fr |
| 4th – 6th Ribs | 13.0mm | 39.0 Fr |
| 7th Rib | 12.5mm | 37.5 Fr |
| Retention Valley | 9.0mm | 27.0 Fr |
| Flared Base Flange | 12.7mm | 38.1 Fr |
👑 Bob's Choice Recommendations
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Experience Level: Intermediate
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The Prime Durometer Recommendation: #10 (Medium) It strikes the perfect balance—providing gentle lateral flex through the 9mm retention valley while preserving enough column strength to guide the 7.5" length smoothly without bowing.
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The Alternative Durometer: Consider #00-50 (Soft) for increased compressibility around the 14mm peak rib segment to ease placement pressure.
Color Options: #18 and #30 are available in pure translucent. #00-20, #00-50, and #10 base colors are translucent white and can be mixed with any standard color.
⚠️ Important Safety Disclaimer: Because individual anatomy varies, we cannot guarantee a full fit for all longer or larger diameter pieces. Please use all products with care. By purchasing, you accept full responsibility for safe use. If you experience discomfort, discontinue use immediately.