Will fit tire size 12.5x2.75, 12.5x2.5, 12.5x3.0 Fits for Razor Dirt Rocket MX350 MX400, X-Treme X-560 and many mobility scooters, Chinese electric scooters, Currie scooters, gas scooters and other applications with same tire size. Also fits many wheelchairs, including ABEC, Invacare, Tiger, and others This inner tube is made of isobutylene isoprene rubber, which is better in air tightness, elastic damping and aging resistance than natural rubber Inflatable inner tube with TR13 straight stem and a cap CUSTOMER SATISFACTION: Before installing, check to see if the inner tubes are completely sealed by putting them in water, if there are any bubbles, they are already damaged. Please contact us, We will provide 100% refund or Free replacement to you soon LotFancy inner tube is made from isobutylene isoprene rubber, which is better than natural rubber in air tightness, elastic damping and aging resistance.