Knobby Jumbo
Recommended for open bore options
Featuring an array of textured surface nodules and a generous, full-length profile, the Knobby Jumbo is a versatile, high-capacity silicone instrument built for deep volume, targeted tactile stimulation, and multi-purpose application. Designed with a smooth, rounded tip for gentle initial placement, the 1.75" (44.4mm) shaft stays uniform along its entire length, lined with rounded bumps that provide continuous, non-binding internal massage. Terminating in a wide retention flange, the Knobby Jumbo functions effortlessly as a high-capacity enema nozzle, long-duration retention plug, internal massage instrument, or harness-compatible attachment.
Multifunctional Design & Anatomical Mechanics
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Smooth Rounded Tip: Engineered with a bulbous 1.75" (44.4mm) dome entry to ease initial passage and guide placement smoothly.
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Textured Knobby Shaft: Features a dense array of soft, rounded surface bumps covering the entire 10" (254.0mm) shaft column for continuous tactile stimulation.
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Uniform 1.75" Diameter: Maintains a solid 1.75" presence along the entire length, offering commanding, consistent internal capacity.
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Harness & Retention Flange: Finished with a sturdy safety flange that anchors securely against external muscles and allows easy integration with standard harnesses.
Dimension & Sizing Profile
| Feature / Dimension | Imperial Value | Metric Value | Profile Function |
| Tip & Shaft Diameter | 1.75" | 44.4mm | Bulbous Tip & Column Width |
| Insertable Length | 10.0" | 254.0mm | Full Usable Column Depth |
| Total Length | 10.25" | 260.35mm | Overall Unit Length |
| Surface Feature | Knobby Array | Textured Bumps | Continuous Tactile Stimulation |
| Base Design | Safety Flange | External Anchor | Harness Integration & Retention |
👑 Bob's Choice Recommendations
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Experience Level: Experienced Intermediate / Advanced. With a substantial 1.75" shaft diameter and a full 10" of completely insertable length, the Knobby Jumbo is an impressive, high-capacity piece. Bob notes that this model provides a commanding internal presence and is recommended for experienced users rather than beginners.
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The Prime Durometer Recommendation: For a textured, multi-functional design of this size, Bob highly recommends selecting #10 (Medium) firmness. This material density provides the ideal amount of structural integrity to keep the shaft from collapsing during placement—especially if you plan to mount it into a harness—while keeping the array of knobby surface bumps beautifully pronounced and effective.
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The Extra-Flexibility Alternative: If you plan to use this piece strictly as a long-duration retention plug or prefer a highly pliable, yielding feel that effortlessly molds to your body's natural contours under muscle pressure, Bob suggests choosing our soft #00-50 (Soft) composition.
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.
