1、Thick Rubber Material: 2PCS 4.10/3.50‑4 Inner Tubes made of thick natural rubber, providing impact absorption, elastic damping, and aging resistance, ensuring durability and safety on rough terrains. 2、TR87 Bent Valve Stem: The heavy duty 4.10/3.50‑4 inner tubes feature TR87 bent valve stems for excellent sealing and air retention, offering superior puncture resistance and a smooth ride. 3、Impact and Puncture Resistance: The natural rubber inner tubes perform better in airtightness, tear resistance, and shock absorption, protecting you from rough terrains and punctures for a stable and safe ride. 4、Long Lasting and Reliable: These replacement inner tubes are designed to be easily replaceable in case of tire blowouts, minimizing downtime and getting you back on the road quickly. 5、Versatile Application: Suitable for heavy duty hand trucks, garden carts, lawn mowers, small tractors, snow blowers, utility carts, trailers, and more. With these inner tubes, you're always prepared for any unexpected tire emergencies. Item Type: 4.10/3.50-4 Inner Tube Material: Rubber Inner Tube Stem Type: TR87 bent stem Rim Size: 4 inches Function: With this inner tube, you can be prepared for any puncture that may occur Fitment: Replacement for hand carts, garden carts, lawnmowers, small tractors, snow blowers, utility carts, trailers, etc. 2 x Inner Tube