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're in the mood for, and it's as simple as popping on the attachment of your choice. Material ABS/PP/PVC Color Black Total Length 4.5 in. (11.4 cm) Width/Diameter 3.75 in. (9.5 cm) Suction Cups Yes