The inner tube is made of isobutylene isoprene rubber, and has better airtightness, elastic cushioning and aging resistance than natural rubber. DO NOT recap Heavy duty tube with bent TR87 valve stem, maximum inflation pressure is 30 . Inflate with hand pump only 4.10 3.50-4 inch inner tube works with hand trucks, carts, garden carts, yard carts, lawn carts, utility carts, flatbed carts, lawn mowers, small tractors, wheelbarrows, garden trailers, carts, wagons, generators, snow blowers and most 410/350-4 wheel applications< /p> FITS 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 CUSTOMER SATISFACTION: When installing, check that the spaces are completely sealed by submerging them in air. If bubbles are present, they are already damaged. Product Description< /p> Feature: Inflatable Valve: TR87