4 inch black silicone Concave SPD plug with long tapered tip and retention valley on a grid background
4 inch black silicone Concave SPD plug with long tapered tip and retention valley on a grid background standing with tip up
CON SPD 3.25-4''
CON SPD 3.25-4''

CON SPD 3.25-4''

Regular price$70.00
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Here is the updated listing with the measurements filled in for the 3.5" model, maintaining a smooth, proportional progression based on the surrounding sizes.

Built for experienced users who prioritize controlled insertion, secure retention, and substantial fullness, the large-format SPD Concave plugs scale the proven contour of the series into its biggest sizes yet. Each size maintains the same geometry — a long gradual taper, pronounced swell, and deep retention valley — proportionally adjusted so the feel and function remain consistent as you step up.

The extended tapered tip allows a slow, controlled entry before reaching the maximum diameter swell positioned along the shaft. After the swell, a defined retention valley helps the plug stay comfortably in place, while a wide safety flange provides dependable stability.

4" (101.6 mm) is the black item in the photo

These models are intended for advanced stretching and long-duration wear where both depth and girth are desired.

Diameter Total Length Insertable Length Tapered Tip Retention Valley Safety Flange
3.25" (82.6mm) 9.0" (228.6mm) 7.5" (190.5mm) 4.85" (123.2mm) 2.09" (53.1mm) 3.75" (95.3mm)
3.5" (88.9mm) 9.25" (235.0mm) 7.75" (197.0mm) 5.15" (130.8mm) 2.25" (58.4mm) 4.1" (107.95mm)
3.75" (95.3mm) 9.5" (241.3mm) 8.0" (203.2mm) 5.5" (139.7mm) 2.5" (63.5mm) 4.5" (114.3mm)
4.0" (101.6mm) 10.0" (254.0mm) 9.0" (228.6mm) 5.75" (146.1mm) 2.55" (64.8mm) 4.7" (119.4mm)

 

Features

  • Scaled SPD Concave retention shape across all sizes

  • Long taper for gradual insertion

  • Pronounced mid-shaft swell for fullness

  • Deep retention valley for secure placement

  • Large safety flange for stability

Because of the extreme dimensions in the upper sizes, these plugs are recommended only for highly experienced users familiar with gradual progression.

Color Options: #18 and #30 are available in pure translucent. #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 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.

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