Office Marshal Eco Office Chair Mat - 36" x 48", Multiple Sizes - Carpet Floor Protection - BPA Free | Opaque Opaque frosted finish - made from durable long-life polyproylene - Phthalate free, BPA free, PVC free and free from harmful toxins Designed to prevent against wear and tear caused by office chair casters. Allows your office chair to move freely while carrying out daily tasks, helping considerably reduce the risk of leg fatigue. Under standard use will not crack, curl, break, scratch or discolor Studded underside holds the mat firmly in place. Suitable for use on low-medium pile carpets (Max. pile: 15mm).