The kit contains foils, pry bars, and patches for easier use and installation. Pack of 16 for everyday needs. Sanding around the puncture hole with sandpaper and then covering with the vulcanized solution, the area must be larger than the patch area. Wait 1-2 minutes, then apply the vulcanized sticker, tap the patch with a rubber hammer or wooden rod, expel the internal air, and wait for it to dry completely before use. Easy and fast.