Apply them directly over your existing wood, concrete or carpeted floor. Installation is easy-no adhesive, no interlocking tabs-simply drop them in place. Best of all, they're worry free...no more floor damage, no more structural damage, and greatly reduced noise levels. Non-marking black color is non-glaring for a soft, satin appearance and will not fade or bleed. They're strong, stable, silent and tough. Tough enough to bounce right back every time! Size: 48" x 72" x 1/2"