If for any reason you are not completely satisfied with your purchase, we will be happy to provide you with your choice of a replacement or refund.We stand by our products 100% and want our customers to love them as much as we do? 11PCS Vulcanizing Patch is included in the kit, and it is individually packaged for easy use at any time. Available in three sizes of 25mm, 30mm, 32*50mm, it can easily deal with large and small Packaged in a small box for take-along convenience?They are fine for all bicycle tubes?Very useful to have if you do not want to have to re-buy a tire just for a tiny hole. Patches for bikes are stronger than your punctured material patches are more durable than the actual rubber inner tube or dinghy materials that you will be patching. Scuff punctured area with metal scuffer (provided) squeeze glue around punctured area and wait 5-minutes. Peel off sliver backing on patch and place over glued area. Press firmly to insure vulcanization. Remove clear top plastic from patch and it's ready for use.