【High Quality Butyl Rubber】It is very suitable for the replacement of 26 inch bicycle inner tubes, it provides better sealing, heat resistance,and durable，and it can keep the air for a long time, you don't need to bother with pumping the tires frequently. 【Inner tube size】26" x1.75/2.125, it is suitable for 26", wide bicycle inner tube between 1.75-2.125", with 32mm" Schrader valve, suitable for most road and mountain bikes. Note: Please check your tire size before purchasing. 【Packing】There are 2 inner tubes and 2 plastic tire levers in one box. The inner tube can be used as a backup, and the tire lever can be reused, which can cope with the problem of inner tube replacement 【Easy to Install】With these 2 plastic tire spudgers, they can help you pry out the old inner tube and install the new inner tube without scratching the rim or inner tube, do it yourself and save money. 【Quality Service】We are dedicated to providing you with excellent quality service, if you are not satisfied with our products, you can contact us, we will help you solve the problem in the first time