SSND-MD 12-21

 Push past your previous boundaries and transition into advanced, high-volume sizing with the SSND-MD 12-21. Crafted specifically for seasoned enthusiasts looking to move safely into an aggressive stretching range, this platinum-cured silicone sound features an expert, five-stage stepped architecture. Based on the proven layout of our popular MD 6-14mm series, this upscaled model utilizes a gently sloping design that gradually guides the anatomy to each consecutive diameter with minimal, highly stable retention valleys—ensuring the instrument continues to exert a steady, comforting stretch even when left resting in place at a single segment.

Anatomical Mapping & Progressive Step Mechanics: The layout of the MD 12-21 functions as a sequential multi-tier wedge where each segment stimulates and spreads the path for the following larger size:

• The Entry: Begins with a smooth, rounded 11mm tip to comfortably initiate wide-gauge entry through the Meatus, dropping into a 10mm initial valley to maintain an approachable start.

• Mid-Canal Progression: Slides smoothly through the Spongy Urethra, climbing through Segment 1 (12.5mm) and Segment 2 (15.5mm). The minimal internal valleys give the delicate tissue a brief zone to settle without losing expansion momentum.

• Deep Stepping: Tracks deeper into the canal through Segment 3 (16.5mm) and Segment 4 (19mm), systematically increasing outward tension with a predictable, highly manageable step-by-step glide.

• The Maximum Capacity Crest: Reaches its ultimate 21mm (63 French) maximum diameter at Segment 5, providing a profound threshold calibration session before tapering into a deep 18mm retention valley just in front of the base.

Anatomical Calibration Layout:  

 
Anatomical Design & Shared Dimensions:

• Insertable Length: Provides a substantial, full-canalled 8 inches of usable depth to the base.

• Sizing Range: Spans an impressive 11mm entry tip up to an extreme 21mm maximum expansion threshold.

• Multi-Stage Stepped Profile: 5 distinct progressive expansion ridges separated by high-retention, shallow relief valleys.

• Retention Flange: Completed with an integrated flare retention flange to guarantee secure external depth control.

👑 Bob's Choice Recommendations

• Experience Level: Very Advanced. Scaling up to a massive 21mm (63 French) maximum diameter and providing an 8-inch insertable footprint, this piece is built exclusively for experienced users looking to execute an aggressive expansion session.

• The Spongy Softness Level (Bob's Prime Recommendation): For an ultra-large multi-diameter sound like this, Bob highly recommends our compressible #00-50 (soft) material. This durometer provides a wonderfully soft, skin-like feeling. Ordering in these levels allows the heavy-gauge segments to compress slightly upon initial entry and then exert a gentle, continuous outward pressure to expand the urethra to your selected size.

• The Moderate Stiffness Alternative: If you prefer a firmer, more definitive column that provides an unyielding, aggressive stretch where the ridges hold their exact dimensions perfectly against tight muscle walls, select our #10 (medium) material option.

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.