This inner tube is made of isobutylene isoprene rubber, which is better in air tightness, elastic damping and aging resistance than natural rubber.NOT recap, Totally Inflatable inner tube with 90° bent angle valve stem and a cap; WIDELY APPLICABLE:12.5x2.25 (12 1/2inchx2 1/4inch) Dirt Bike Replacement Inner Tubes Our product is simple to replace. Believe me It doesn' take your much time to change the tire Colour:Black Material:rubber Size:12.5x2.25inch/30x5.7cm Package Contents: 2 * Inner Tubes Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.