Your perfect strap-on experience is on lock with Doc Johnsonâs deluxe line of full-service Vac-U-Lock Harness Sets.The Vac-U-Lock Dual Density Experienced Set is an excellent choice for experienced strap-on players and those accustomed to deeper penetration. A complete harness with removable o-rings and plug, three dual density ULTRASKYN attachments, and a bottle of Mood water-based lube make an intense strap-on romp as easy as 1-2-3. Featuring the dual density effect--a soft, pliable exterior that gives way to a firm inner coreâin lifelike material that warms to the touch, realistic attachments in 8, 9, and 10 inch sizes impart a strong and realistic sensation. Attachments can be used with the harness, the included Vac-U-Lock suction cup, and any other accessory or harness in the line. The Vac-U-Lock Dual Density Experienced Set also includes Doc Johnson Natural Toy Cleaner and ULTRASKYN Refresh Powder to properly and hygienically maintain your dual density ULTRASKYN attachments. Every product in the patented Vac-U-Lock system is designed to help you create any strap-on or toy youâre in the mood for, and itâs as simple as popping on the attachment of your choice.