Features1It is made of butyl rubber material with greatly improved airtightness, temperature resistance, delay aging and longer service life. 2With schrader air valve, it is no need to replace the valve core, which is convenient to use. 3The butyl rubber tire inner tube can absorb the vibration of uneven roads to ensure the comfort and safety of driving. 4Easy to install, you can easily replace the old inner tube of the tire in a short time, saving time and efficient. 5It widly fit 12 / 14 / 16 / 18 inch wheel, width between 1.752.125inch tires, suitable for replace the inner tubes of road mountain bikes.SpecificationItem Type: Bicycle Inner TubesMaterial: Butyl RubberProduct Color: As Pictures Shown Product Weight: Approx. 145-180g / 5.1-6.3ozValve Type: Schrader ValveMaximum Air Pressure: 8 BarStandard Pressure: 20Package List1 x BikeInnerTubes