Rubber-Cal Shark Tooth Heavy Duty Mat Heavy duty mats with high contents of EPDM resists UV/ozone; perfect for protective flooring for outdoor or indoor spaces Thick floor mats can be used as protector mats to protect subsurface floors from damage due to heavy machinery or furniture Made domestically from 100% tire crumb, this recycled mat is as durable and weather resistant as the tires they are molded from Thick cushion provides excellent anti-slip and anti-fatigue rubber tile, creating a safe and comfortable environment for the home or office