We recommend these pads for use over dry wall or gypsum sheet rock because their rigid plywood backing provides extra wall protection. In fact, they're the right choice for most installations. Choose from two foams: our popular 2" thick prime polyurethane or 1-3/8" firm polyethylene, and two mounting styles: a standard 1" nailing lip top and bottom, or the convenient Z-Clip fastening system. The two-part Z-Clip runs the width of the pad, replacing the top nailing lip (the bottom nailing lip is still used). Perfect installations have never been easier! http://store.clubstuff.com/gymnasium-equipment/wall-pads-protective-padding