Features: 1Using butyl rubber material, it has better air tightness, heat resistance and durability. 2It can be used normally for more than 100 days after inflating, and it is the most commonly used inner tube material. 3The butyl rubber tire inner tube can absorb the vibration of uneven roads, thus ensuring comfortable and safe driving. 4Simple installation, and the old tire inner tube can be easily replaced within a few minutes, which is time?saving and efficient. 5Equipped with a bent valve, it widly fit 16 inch wheel, width is 2.125 inch tires. ?Item Type: Electric Bicycle Inner Tubes Material: Butyl Rubber Product Color: As Pictures Shown Product Weight: Approx. 163g / 5.7oz Gas Nozzle Type: Bent Angle Valve Package included:1 x Electric Bicycle Inner Tubes