"Secure and transport a single canoe on a vehicle's roof without requiring existing side rails or cross bars with an Elevate Outdoor canoe carrier kit. Each kit includes four 5.75"" by 3.75"" by 3"" foam blocks with open slots for the canoe hull wall, that effectively create a buffer between the vehicle roof and canoe once installed. Includes three cam buckle tie-down straps, four steel S-hooks, and two tie ropes for bow and stern securing. Stores in a handy nylon mesh bag with cinch strap. Foam blocks are made with high-density polyethylene foam for a firm grip to the vehicle roof and kayak."