Feature: 1. Using butyl rubber material, it has excellent air tightness, good resistance to cold and heat, and aging resistance. 2. The butyl rubber tire inner tube can absorb the vibration of uneven roads, thus ensuring comfortable and safe driving. 3. Simple installation, and the old tire inner tube can be easily replaced within a few minutes, which is time‑saving and efficient. 4. Equipped with a bent angle valve, it wildly fit for 16x2.50inch electric bicycle tires. 5. It will never let your electric bicycle go flat with a replacement inner tube tire on hand. Specification: Item Type: Electric Bicycle Inner Tubes Material: Butyl Rubber Product Color: As Pictures Shown Product Weight: Approx. 264g / 9.3oz Gas Nozzle Type: Bent Angle Valve. Package List: 1 x Electric Bicycle Inner Tube Note: 1. Confirm whether the specifications of the inner tube match the outer tube. When installing the inner tube into the outer tire, please carefully check whether there are sand particles in the inner space of the outer tire, whether there are cracks or other undesirable factors.2. Please check the steel rim carefully when installing the tire, and make sure that the steel rim has no defects such as deformation, burrs, foreign bodies, etc.3. When installing the tire, be sure to put the lug tape on the steel ring first to prevent the inner tube from being punctured.4. Before the inner tube is inflated, be sure to check whether the inner tube is sandwiched between the steel rim and the tire lip. Please inflate strictly according to the marked air pressure of the tire to prevent accidents caused by insufficient or excessive inflation.5. After the tire is installed, please check the valve valve to prevent air leakage, and lock the valve core with the rubber cap.