WEARWELL Electrically Conductive Anti-Fatigue Mats are for use in areas where the buildup of static electricity can harm equipment. Will drain an electric charge of 20,000 volts in less than one second. Volume resistivity and resistance to ground is 10(6) ohms. Sponge base with diamond plate design provides superb cushioning support to ease back and leg stress. Mat should be grounded for maximum effectiveness. 1/2" thick. Color: black.NOTE: Custom-cut mats up to 75' long are available, call a Certified Product Specialist to order.