IncStores Premium Interlocking Foam Tiles (Grey, 12 Tiles) - Ideal for p90x, Insanity, pilates, yoga, other aerobic/cardio work outs, and kids playrooms Made from non-recycled, non-toxic, light weight and durable High Density Closed Cell EVA Foam Two Detachable edge pieces allows any tile to be a border, corner, or center Our easy do-it-yourself tiles are an excellent protective floor covering