General description This inner tube is made of isobutylene isoprene rubber, which offers superior airtightness, elastic cushioning, and aging resistance compared to natural rubber. It is a heavy-duty inner tube equipped with a TR87 bent valve stem and has a maximum inflation pressure of 30 PSI. Technical specifications Size: 4.10/3.50-4 inch Outer diameter: 10 inches Maximum inflation: 30 PSI Compatibility and accessories Compatible with hand trucks Dollies Garden carts Yard wagons Lawn carts Utility carts Flatbed trucks Lawn mowers Small tractors Wheelbarrows Garden trailers Dolly carts Wagons Generators Snow blowers Most 410/350-4 wheel applications Installation Before installation, check if the inner tubes are completely sealed by immersing them in water; if bubbles appear, the tubes are damaged. Inflate using a hand pump only.