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.