The base is made from rugged bonded polyester padding that is tear-resistant and waterproof. The base is easily bolted to its anchor plate. Anchor plate contains a metal sleeve for added stability. This base is designed to reduce sliding injuries it is not a substitute for using proper sliding  15"L x 15"W x 3"H. COMPLETE SET OF 3 BASES AND 3 STAKES . Material: Rubber Color: White