Polytene Office Chair Mat, 48"x36",Hard Floor Protection Only with Rectangular Shaped Clear Anti Slide Film on The Underside, and mat Finish on The top, 1.55mm, Black100% pure polytene material No oisonous and tastele, better flexibility and durability. Designed for hard floor surfaces ONLY NOT suitable for carpets or half rug. Under standard use will not crack, curl, break, scratch or discolor. Scuff and Slip Resistant Textured Top Surface. Special Anti slide Film on the underside which is designed to keep them firmly in place while in use. No off gassing Odorless for a healthy indoor environment. Allows office