Vac-U-Lock Deluxe 360 Degree Swivel Suction Cup Plug from Doc Johnson Novelties. This super strong suction cup featuring the patented Vac-U Plug on a rotating ball joint fits any attachment in the Vac-U-Lock collection and powerfully adheres to any smooth, non-porous surface. Designed for hands free use of all your favorite Vac-U-Lock products, this suction cup's built in plug swivels in any direction and angle to work every one of your hot spots from the inside. Every product in the patented Vac-U-Lock system is designed to help you create any strap on or toy you are in the mood for, and its as simple as popping on the attachment of your choice. Materials ABS plastic, Polypropylene PP, PVC. Size 4.5 inches by 3.75 inches. Please note shown with a dildo attached, not included. Sold separately.