General description The 2 Pack 4.10/3.50-4' Truck Inner Tubes are designed for various applications including hand trucks, garden carts, lawn mowers, and more. Made from isobutylene-isoprene rubber, these inner tubes offer superior air tightness, elastic cushioning, and aging resistance compared to natural rubber. Technical specifications Material: Isobutylene-isoprene rubber Maximum filling pressure: 30 PSI Size: 4.10/3.50-4 inches (10 inch outside diameter) Compatibility and accessories Compatible with 4.10/3.50-4 inch tires/wheels Works with hand trucks, carts, garden carts, lawn mowers, small tractors, wheelbarrows, trailers, and more Usage Inflate using a hand pump only