Who doesn't want a lighter bike inner tube? Then here we are. * This inner tube cannot be inflated a lot when it is not installed in the outer tire, otherwise it will cause irreversible damage! * The special new TPU material has excellent resistance to puncture. Using the integrated manufacturing technology, there are no seam marks around the inner tube, and a circle of interfaces around the inner tube air nozzle reduces the chance of trachoma in the inner tube. * The ultra-light weight is only 36g for road tube and 45g for gravel tube, which is about 100g less than the traditional butyl rubber inner tube, and a pair saves 200g! * When using the patch, first clean the surface with the alchohol cleanser, apply the patch, and wait for 5-10 minutes for the patch to fully attached to the tube. (DO NOT inflate more than 70psi when you are using patch)