Material: Butyl Rubber. 12-/2 .75 2-/4Curved AV Nozzle Inner Tube For Folding Bike Bicycle. Model: 12-/2 .75 2-/4. Size:12-/2 .75 2-/4. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.