Features: Made of high-quality PVC material, wear-resistant, wrinkle-resistant and has strong toughness. Used between the steel rim and the inner tube to prevent the spokes from piercing the inner tube. It can make the tire pressure higher, the tire resistance is smaller, and the tire blowout can be prevented more effectively. Multiple lengths and sizes are available to meet your different needs. It suitable for MTB, mountain bikes, road bikes, etc. Easy to install, just stretch them over your rims and put them stay in place.