Usage Tips:Product descriptionMaterial: PUSize: 135 * 25mm 180 * 30mmThickness: 2mmStyle 1: 8 pieces 130mm * 25mm * 2mm (white), 8 pieces 180mm * 30mm * 2mm (black)Style 2: 8 pieces 130mm * 25mm * 2mm (black), 8 pieces 180mm * 30mm * 2mm (white)Package includes 16 pieces of non-slip solid patch for trapezoidal carpet1. Select 2 sizes - Carpet stoppers have two different sizes. 130 * 25mm * 8PCS & 180 * 30mm * 8PCS. Both are 2mm thick and are suitable for almost all types and shapes of carpets. Perfect for indoor and outdoor use.2. Easy installation and removal - One side of paper protective film is glued to the carpet. The other side with that is glued to the floor. If you want to remove or clean it, simply unscrew it from the floor by slowly lifting it up.3. Washable and Reusable - Non-slip carpet cushions are made of reusable PU gel with no odor. If it gets dirty, just wash the carpet grippers with soap and water and let it air dry. It leaves no residue on your precious floors4. Harmless to the floor - Carpet grabs are made of soft PU material that does not damage the floor in any way. The sticky surface leaves no residue on the floor when removed and works well on hard floors including tile, ceramic, hardwood, laminate, etc.5. materials -Carpet Grippers material is PU elastomer, high temperature resistance, environmentally friendly, no deformation, easy to restore. If the viscosity of the rug gripper is weakened by dust, it only needs to be cleaned with clean water and it will become sticky again after drying.