Office Marshal Chair Mat for Carpet Floors, Low/Medium Pile - 36" x 48", Multiple Sizes - 100% Pure Polycarbonate, No-Recycling Material - Transparent, High Impact Strength Clear, highly transparent, 100% pure polycarbonate - allowing the aesthetic of your floor to show through. 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. Designed for use on carpet floors | Under standard use will not crack, curl, break, scratch or discolor Studded underside holds the mat firmly in place | Suitable for use on low and medium pile carpets (Max. pile: 0.6")