CON SPD 3.25-4''
- In stock, ready to ship
- Backordered, shipping soon
Recommended for open bore options
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
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Scaled SPD Concave retention shape across all sizes
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Long taper for gradual insertion
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Pronounced mid-shaft swell for fullness
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Deep retention valley for secure placement
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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.