The Andersen Company No. 421 Hog Heaven Wet/Dry Anti-Fatigue Mat has a nitrile rubber top surface that is 20% recycled content. This electrically conductive mat features a closed cell nitrile blended cushion that is permanently molded (not glued) to the top surface and rubber borders that will not crack or curl. The Hog Heaven indoor mat is recommended for a variety of industrial type environments because its chemical resistant, welding safe, and grease and oil proof. It's made in the USA and certified slip-resistant by the National Floor Safety Institute.