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