This inner tube is made of isobutylene isoprene rubber, which is better in airtightness, elastic damping and aging resistance than natural rubber. NOT recap Heavy duty inner tube with TR87 bent valve stem, max inflation is 30 PSI. Inflate with Hand Pump Only 4.10 3.50 - 4 Inch Inner Tube Works with Hand Carts, Carts, Yard Cart, Yard Cart, Lawn Cart, Utility Cart , flat carts, lawn mowers, small tractors, wheelbarrows, garden trailers, cart carts, wagons, generators, snow blowers and most 410 / 350-4< wheel applications /p> Perfect fit for 4.10/3.50-4 inch TIRES/WHEELS: Replacement tubes for 4.10 / 3.50-4 tires / wheels (10 inch outside diameter). also measured in 4.10 3.50-4, 410/350-4, 3.5-4 4, 4.1/3.5 4, 4.10 3.50 4, 4.10 3.50-4 , 4.10/3.50-4, 4.10/3.50-4 inch, 4.10x3.50 -4 inch Note: The data are all manual measurement, please allow 1 - 3cm error, due to the light and display difference, there will be some color difference, depending on the physical object received Shipping Quantity: (according to the main picture)