M+A Matting 524 Nitrile Rubber Hog Heaven Modular Tile II with Grit and Black/Yellow Strip Side Border, 21.87" Length x 18" Width x 3/4" Thick Nitrile rubber top with closed cell nitrile rubber cushion backing Outstanding anti-fatigue qualities for dry areas Closed cell nitrile rubber cushion provides long lasting comfort Welding safe Measures 21-7/8-inches length by 18-inches width by 0.75-inches thickness