Topeakmart Chair Mat Carpet Protector (Convex) Anti-Slip backing,prevents the mat from sliding. Suitable for all hard floors including laminates, parquet, tiles or stone. Extremely durable, made from non-toxic materials that are 100% recyclable. Material: premium PVC,Net Weight: Approx.4.4lbs Please note: Its been curly packaged during the transport, you just need to make the incurved side facing the bottom of the floor and put it aside over a period of time.