Specification: Material: foam + glue, Size: 3*4.6*0.1cm, Color: Black, Quantity: 10/30/50pcs. Steps to use: 1. Polish the edge of the hole into a rough surface with a file tire sheet or sandpaper. 2. Clean up the polished surface. 3. Align the center position of the tire repair piece with the hole and press it tightly. 4. After standing still for 5 minutes, put it into the outer tire to inflate and complete the tire repair.