TUFF-SEAL 17.68" X 17.68" X 6.5mm Water Proof Hidden Interlocking Tabs for a water tight seal. Heavy-duty, injection-molded, solid vinyl commercial flooring that contains twice as much premium-quality material (3.5 lb. per tile) as the typical lightweight, rigid-plastic tile. It will not chip, crack, shift, loosen, split, or deflect under heavy stationary or rolling loads including aircraft, forklifts, automobiles. BROCHURE