PRODUCT DESCRIPTION Box contains only single tire tube. Ride harder and ride longer. Military-grade butyl rubber tube with variable thicknesses keep weight down and give your tires strength where you need it. Upgrade your bike and avoid punctures with these heavy-duty, ultra-grade fat-tire bike tubes perfect for both electric and traditional fat-tire bikes. The heavy thickness (3.5mm) of the rubber at the base of the tire tapers up to a thinner, light-weight thickness (1.8mm) against the rim of the tire. This is an incredible upgrade from the standard 1.7mm thickness in a traditional fat-tire tube and takes the protection against punctures to the next level. Each tube include an easy-to-inflate Schrader Valve that allows airflow in only one direction, also allowing you to check the air pressure. Ride more and worry less with Bakcou&';s new Heavy Duty Fat Tire Tubes. FEATURES 3.5mm thickness at the base of the tire, tapers to 1.8mm at the rim Military-grade Variable thickness Avoid punctures Extra-long Schrader Valve The Most Durable eBike Tube on the Market