Works with many hand trucks, dollies, lawn mowers, wheelbarrows, and scooters. Replacement Tube for 8.5" Outside Diameter Tire, Compatible with a 4" rim, no wheel included. 2.80/2.50-4" inner tube can fit Razor Scooter E300, Pocket Rocket, and Chopper. Made from isobutylene isoprene rubber, NOT recap, 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 TR87 bent valve stem and a cap, Extra secure welded seams, high puncture resistance.