Specification: Material: rubber, plastic, metal Quantity: 30 pieces Gross weight: 60g/2.12oz Package Size: 13.3 * 7.5 * 2.4cm/5.24 * 2.95 * 0.94in Package includes: 12 * rectangular patch, no glue 12 * round patches without adhesive 4 * metal grater 2 * plastic crowbar 1 box of storage how to use: 1. Locate and mark the puncture site; 2. Deflate the tube and keep it dry. 3. Grind the punctured area with a metal file (the polished area should be slightly larger than the patch); 4. Carefully peel the patch from the yellow waxed paper on the back. 5. Place the self-adhesive patch in the center of the leak hole and stick the patch. 6. Align the center of the tire piece with the hole, fix it and press firmly; 7. After waiting about 3-10 minutes, insert the inner tube back into the tire and inflate it. Good Tips: When removing the color blocks from the yellow wax paper , do not touch the sticky area on the back. After repairing a puncture on your bike, wait at least 15 minutes before riding. The surface around the leak hole n is not cleaned, or the inner tube is installed incorrectly, and the inner and outer tires are installed incorrectly, which will cause the tire repair to fail.