About this item Designed for HARD FLOOR surfaces only. No gripper. Transparent surface, anti-slide coating on the underside which is designed to keep them firmly in place while in use. Please put the smooth side facing down, the rough side is up. No Phthalate, No Toxins, No Cadmium, No Tin and No Lead. keep a healthy indoor environment while give your floor and furniture the best protection. This PVC chair mat is ergonomically designed to provide added ease of movement, it’s very flexible, which proven to reduce leg fatigue by taking the strain off your legs. you can choose the Rectangle one or the one with lip as you like. Effectively helps to prevent damage to hard flooring caused by your office chair casters or wheels. Under standard use will not crack, curl, break, scratch or discolor. Multipurpose Use: ChairMat, Wood Floor protector,Computer/Office Mat. Suitable for hard floors including vinyl, stone, tile, wood, laminate and concrete. Not recommended for carpet, please see our carpet mat if you need.