<b>Package Included:</b></br>4 bike tubes（16"）</br>2 x tire lever</br><br>Valve Type: Schrader Valve</br>Valve Length: 32mm</br>Tube Material: Butyl</br>MORE DURABLE: High-quality butyl rubber compound, Better air tightness and a longer lasting tube.</br><b>Note:</b></br>1. Before installing an inner tube into a tire, please check if there is any sand grain inside the tire or if there is any cracks or other adverse factors in the tire.</br>2. Before installing an inner tube, please check carefully whether there is any deformation or bend in the steel rim. During the installation, do not clamp the inner tube between the tire and the rim to prevent any clamping of the tube.</br>3. When removing or installing an inner tube, do not use any sharp installation tool to prevent the inner tube from being pierced.</br>4. When putting the inner tube into the tire, the valve should extend from the rim properly so that the inner tube can be placed inside the tire more naturally and used for a longer time.</br>5. When both the inner tube and the tire have been installed in the rim, inflate the inner tube with 10PSI air and then check whether the inner tube has been locked in the rim properly and, if so, continue to inflate the inner tube to the standard pressure.