Beveled edges release water and eliminate peel up. Hassle Free installation with easy peel & stick (PSA) backing. NSI utilizes the most aggressive 3M PSA available. Dual Density Padz are a 1/4 inch top layer with an added 1/8 inch softer underlay. The underlayer adds additional shock absorption and helps to spread the load on big landings. 16 inches wide at front, 13-1/2 inches wide at rear and 35 inches long.