Vibrating Dual Density Ultraskyn Set By Doc Johnson

Switching between different sizes and styles mid-session means constantly buying separate toys. The Vac-U-Lock Vibrating Dual Density Ultraskyn Set Chocolate solves that with three interchangeable attachments in one harness system, letting you customize your experience without clutter or expense.

What it is

The Vac-U-Lock Vibrating Dual Density Ultraskyn Set Chocolate is a three-piece collection built around Doc Johnson's patented quick-change system. Each dildo features realistic ULTRASKYN material with a soft outer layer and firm inner core, delivering lifelike sensation and durability. The 8-inch, 7-inch, and slim 7-inch options attach instantly to a single adjustable harness without tools or fuss. A wireless remote controls seven vibration patterns across all three attachments, so you can switch sizes mid-scene and keep the same stimulation settings.

What sets this apart is the engineering: every attachment sits on a 360-degree swivel suction cup base, so you can position it hands-free or anchor it to any smooth surface. The harness accommodates waists up to 69 inches and comes with multiple O-ring sizes for a secure fit. See the full BDSM Australia range of Strap-On-Me options to compare harness styles and explore other interchangeable systems.

Key features

• Three distinct sizes: 8-inch realistic, 7-inch, and slim 7-inch options let you match the attachment to your body and experience level.
• Dual-density ULTRASKYN: Soft, lifelike outer layer over a firm core; body-safe, phthalate-free, and designed to last.
• Wireless vibration: Seven programmable patterns and intensities controlled remotely; works on all three attachments simultaneously.
• Vac-U-Lock system: Attachments lock and release in seconds; no screwing or complicated assembly between sizes.
• Suction cup base: 360-degree rotating design anchors to any smooth surface for hands-free penetration or solo use.

Specifications

• Dimensions: 8-inch attachment is 8.25" long and 1.75" wide; 7-inch attachment is 7.25" long with 5.5" circumference; slim 7-inch matches the standard length.
• Material: Phthalate-free ULTRASKYN with medical-grade silicone components; all body-safe and non-porous.
• Power: Rechargeable lithium-ion battery via USB; wireless remote with up to 30-foot range.
• Harness: Adjustable waist strap fits 20–69 inches; includes multiple O-ring sizes for secure attachment.
• Special features: Fully waterproof design; includes toy cleaner, refresh powder, lubricant, and comprehensive accessory kit.

How to use a strap on sextoy

Begin by selecting which attachment suits your goal. Slide the dildo's base into the Vac-U-Lock harness until you hear a click, confirming it's locked. Adjust the harness straps snugly around your hips and thighs—it should be firm but not cutting off circulation. Apply water-based lubricant generously to the attachment and the receiving partner's opening. Power on the remote, choose your vibration pattern, and insert slowly and deliberately.

Communicate constantly with your partner about depth, speed, and intensity. Use the remote to vary sensations without pausing play. To switch attachments, power down the remote, unlock the current piece by twisting slightly, and snap the new one into place. Many users explore different combinations across a single session to discover what works best. Check out the Pornhub Sextoys collection if you're seeking inspiration or additional accessories that pair well with this system.

Care and storage

Clean each attachment and the harness with warm water and included toy cleaner after every use. Pat dry completely before storage. Apply the refresh powder to maintain ULTRASKYN texture and prevent stickiness. Store the set in a cool, dry location away from direct sunlight and extreme heat. Keep attachments separate from the harness to prevent material degradation. Check the remote's battery level regularly and recharge via USB when needed.

Learn more

Understanding harness fit, positioning, and communication transforms your experience with this system. The interchangeable design opens up play styles that fixed toys cannot match. Read On Your Back for detailed guidance on strap-on technique and partner communication.

Mistress Athena's training notes

By Mistress Athena — professional dominant and kink educator, sole instructor behind BDSM Australia's library of training videos. Read her full bio →

This set's true power lies in psychological control through unpredictability. My submissives never know which attachment I'll select or when the vibration will intensify. Starting with the slim piece establishes compliance; the transition to larger sizes becomes a reward for obedience or a punishment for hesitation. Each click of the Vac-U-Lock registers in their mind as a shift in dominance, heightening their focus and submission.

The wireless remote transforms me into an invisible director. My submissive feels the vibration change but cannot predict it—I control every sensation, every moment of pleasure or denial. This uncertainty deepens their psychological surrender far more than size alone ever could. The dual-density material's realistic texture amplifies the sensation of penetration, making their physical response more intense and therefore easier to read and manipulate.

Positioning matters enormously in my scenes. The suction cup base allows me to anchor the attachment while my hands remain free for impact play, sensory deprivation, or restraint. My submissive lies vulnerable, unable to control depth or pace, entirely dependent on my remote. I've found that combining vibration with verbal degradation or bondage creates a multi-sensory experience that breaks down resistance and builds lasting psychological conditioning.

See this and similar tools in action across my 300+ training videos on the BDSM Australia channel.

How it compares

Why you'll reach for it

Explore the freedom of switching between three distinct sizes and vibration patterns without buying three separate toys. The Vac-U-Lock system at BDSM Australia makes customization instant and seamless, whether you're experimenting solo, with a partner, or in a power-exchange dynamic. The wireless remote puts control literally in your hand. Order now and discover how one harness delivers the versatility of an entire collection. Buy Genuine BDSM Brands with Confidence.