Chairmat with lip dissipates static electricity to protect electrical equipment from the damaging effects of static. Use on standard-pile carpets up to 3/8" thick. Unique, phthalate-free PVC formulation provides the clearest, most durable antistatic mat. Computex Advantagemat Antistatic Chairmat is 100 percent free from cadmium and lead. Lip measures 10" x 20".