This inner tube is made of isobutylene isoprene rubber, which is better in air tightness, elastic damping and aging resistance than natural rubber. NOT summarizeHeavy duty inner tube with TR87 bent valve stem, maximum inflation is 30 PSI. Inflate with hand pump only4.10 3.50-4 inch inner tube works with hand trucks, dollies, garden cart, yard wagon, lawn cart, utility cart, flatbed trucks, lawn mowers, small tractors, wheelbarrows, garden trailers, dolly carts, wagons, generators, snow blowers and most 410/350-4 wheel applicationsPerfect fit for 4.10/3.50-4 inch TIRES/WHEELS: Replacement tubes for 4.10/3.50-4 tires/wheels (outer diameter 10 inches). 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 inchCUSTOMER SATISFACTION: Before installation, check if the inner tubes are completely sealed by submerging them in water, if there are bubbles, they are already damaged.