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. -Product Details- Material: PVC / ABS / Polypropylene. Texture: Smooth. Color: Black. Length: 4.5 inches. Diameter: 3.75 inches.