Herco 4' x 5' All Purpose 1/8" Corrugated Rubber Mat - Black 1/8" thick commercial-grade 100% Nitrile Rubber construction for superior durability and comfort Corrugated Rubber Runner Mats are resistant to curling, cracking, and warping. Non-slip V-groove design for extra traction and durability Specially compounded for use as a surface covering. Backside has a textured finish. Extended wear, all-weather, chemical-resistant, ultra protective.