Made of 100 percent post-industrial recycled PVC, Flooring Adventures Tuff-T-Lock tiles utilize an interlock system that creates a locked, water-resistant surface that will not crack, deflect or shift under heavy rolling loads. Easily installed over existing concrete floors using a simple overlap and tap process, Tuff-T-Lock flooring requires no adhesive and minimal subfloor prep. Tuff-T-Lock tiles are slip-resistant, muffle noise, dissipate vibration and reduce standing fatigue. Tiles are 20-1/4" by 20-1/4" in size, and 13/64" (5 mm) thick. Backed by a 5-year warranty.