Marble Sof-Tyle Anti-Fatigue Mats feature a smooth marble-pattern top surface of heavy-duty rubber combined with a dense closed cell foam base utilizing NOTRAX exclusive UniFusiontrade; technology. UniFusiontrade; bond is guaranteed for the life of the mat Overall mat thickness .5 Sloped beveled foam on all 4 undersides affords easy access onto and off of mat Perfect for lab testing areas, check-out corners, and order fulfillment lines