Features: 1Protective Function: Long service life, not easy to leak and damage, can increase the life of the tire, can maintain the correct internal pressure, reduce the tire side excessive twists and turns. 2High Performance: Made of high quality butyl rubber, with good air tightness, heat resistance and durability. Air nozzle is high air tight air nozzle, stable and durable. 3Good Air Tightness: With excellent air retention performance, under normal use for months without air pumping, saving time, to avoid frequent air pumping trouble. 4Application Scope: The size of our bike tube is 26x1.9/2.125in, suitable for replacing inner tube of mountain bike 26in wheels (check how many inches bicycle tires are before ordering), and suitable width is between 1.9/2.125in. 5Warm Prompt: Do not use pointed mounting tools when removing or installing the inner tube to avoid puncturing the inner tube. Item Type: Bike Inner Tube Material: Butyl Rubber Color: As Picture Shown Application: for Road Bike Gross Weight: Approx.238g/8.4oz Valve Type: A/V (Nozzle) Package Included: 1 x InnerTube