【Specialized Designed】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. 【Best Protection】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. 【Specifications】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. 【Safe For Your Home】 The chair mat is Odorless, No Phthalate, No Toxins, No Cadmium, No Tin and No Lead. keep a healthy indoor environment . It is 100% pure Polyvinyl chloride chair mat. Rest assured you are buying a safe option for your home or office. 【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.