Hamby's Beach Bumper provides the ultimate protection for your boat's bow and keel. It works on any V-hull boat and is so tough and resilient that it allows you to beach your vessel on rocky shorelines or even concrete launch ramps! 5/8" thick at the center, they will likely last the life of the boat, improve the resale value, and are made of injection-molded urethane for optimum abrasion resistance. They also feature a lifetime product warranty. Due to the technical nature of the adhesion process and to guarantee lifetime performance, they must be installed by a trained dealer.