Package include:
2 x 24 Bike Tubes
Tube Replacement: The bike tube is made from premium butyl rubber. It features better sealing performance, ozone resistant, anti-aging, shock absorption and electrical insulation merits.Bicycle inner tubes are always available at home, necessary for enjoyable riding.

Specification:

Valve Length: 35mm (standard bicycle tire Schrader valve length)
Tube Material: Butyl
MORE DURABLE: high-quality butyl rubber compound, Better air tightness and a longer lasting tube.

PS--
1.Please kindly confirm the size of your bike tire before you buy, width between 2.10-2.4 tire.
2.Before changing the tube, please check whether have some stones or sharp things that may broke the tube that stay in your tire.
3.Remember to always add a little air (to give the tube form) to the new inner tube before installing. This will prevent it from bunching up and/or causing a pinch flat or possibly blowing the tire off the rim (when you immediately and fully inflate) which ultimately will pop the tube.
4.Never over inflate past the recommended tyre pressure.