Package: including 1 inner tube of mountain bike, 2 nylon tyre levers, 3 pieces in total; the tyre lever is a good helper when you install the tyre; it helps to remove the inner tube and support it, so that you can install it more conveniently High quality materials: the materials of our bicycle inner tubes are carefully selected; the inner tube is made of the high quality tough rubber material which has seamless structure and is very durable; please use it at ease Advantages: our bicycle inner tube has good properties, such as good air-sealed, strongly heat-resistance, strong anti-aging and easier to inflate; good air-sealed means that you can ride long time without having to spend much time inflating the tire Note: when replacing the inner tube of bicycle, please carefully check whether there are foreign matters inside the outer tube, and make the inner tube completely placed inside the outer tube; do not over inflate the tire as it will burst Application: the size is 24" x 1.75" / 2.125 ", which is suitable for the replacement of the inner tube of mountain bike; if there are any problems, please contact us in time, we will try to give you a satisfactory reply Features: Suitable for the replacement of the inner tube of mountain bike, made of high quality material, strong and durable High air-sealed means you don't have to spend a lot of time to inflate multiple times Specifications: Material: Bicycle inner tube: Rubber Tyre lever: Nylon Size: 24 x 1.75/ 2.125 inches Quantity: 3 Pieces Package includes: 1 x bicycle inner tube 2 x tyre levers