The inner tube is made of isobutylene-isoprene rubber, which has better air tightness, elastic cushioning and aging resistance than natural rubber. DO NOT recap High-performance tube with bent TR87 valve stem, the maximum filling pressure is 30 . Inflate with hand pump only 4.10 Inner Tube 3.50 - 4 inch Works with hand trucks, carts, garden carts, garden trolleys, lawn carts, utility carts, flatbed trucks, lawn mowers, small tractors, wheelbarrows, garden carts, trailers, wagons, generators, snow blowers and most 410/350-4 wheel applications< /p> Fits 4.10/3.50-4 inch tires/wheels: Replacement inner tubes for 4.10/3.50-4 (10 inch outside diameter) tires/wheels. also measured at 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 inches, 4.10x3.50 -4 inches