2 Pack 20" Fat Tire Tubes 20" x 4.0" TR4A-40L Valve Heavy Duty 20" Fat Bicycle Tubes Compatible with 20x4.0 20x4.2 20x4.3 20x4.4 20x4.5 Electric Bike/Mountain Bike Fat Tire Tubes

Still searching for the most durable bike inner tube? Stop looking up now and try ours. It will exceed your expectation! Features: Made To Last: The bicycle mtb inner tube is made with steady and durable butyl rubber. It shows amazing sealing performance, ozone resistant, anti-aging and electrical insulation merits. Size Available: The bike tube 20×4.0". It fits tire width 4.0/4.5''. Comfort is the first: The replacement tires ensure better shock absorption for upgrade riding experience. Your safety and comfort is our top concern.