Made from excellent physical property material, this replacement cylinder mat is scratch proof,waterproof and anti-stick. Item Size: Approx. 16 X 15.7 X 0.8 inch Easy To Replace: 1. Please empty remaining cat litter inside before you replace the litter pad; 2. And then take out the filter screen; 3. Remove the previous litter pad from the under buckles in numerical order; 4. Place the new litter pad into the cylinder, align the snap positions, clip the lower edge into the corresponding snaps, and fix the edge under the firm. Make sure all snaps have been fixed in place after installation. ‌Made from excellent physical property material, this replacement cylinder mat is scratch proof,waterproof and anti-stick.Item Size: Approx. 16 X 15.7 X 0.8 inchEasy To Replace: 1. Please empty remaining cat litter inside before you replace the litter pad; 2. And then take out the filter screen; 3. Remove the previous litter pad from the under buckles in numerical order; 4. Place the new litter pad into the cylinder, align the snap positions, clip the lower edge into the corresponding snaps, and fix the edge under the firm. Make sure all snaps have been fixed in place after installation. Made from excellent physical property material, this replacement cylinder mat is scratch proof,waterproof and anti-stick. Item Size: Approx. 16 X 15.7 X 0.8 inch Easy To Replace: 1. Please empty remaining cat litter inside before you replace the litter pad; 2. And then take out the filter screen; 3. Remove the previous litter pad from the under buckles in numerical order; 4. Place the new litter pad into the cylinder, align the snap positions, clip the lower edge into the corresponding snaps, and fix the edge under the firm. Make sure all snaps have been fixed in place after installation.