Specially formulated nitrile rubber composite is 100% anti-microbial and withstands animal fats, fish and vegetable oils, and compounds used in a wide variety of food processing Built-in handles ease cleaning of mats Hygenic porthole and solid underside design simplify cleaning and virtually eliminate areas where food and bacteria can collect Substantial underside knobs for increased comfort Textured surface increases traction when greasy and wet Terra cotta Compliance Meet NSF antimicrobial test ASTM™ G21-96 (2002).