Size: 26” x 4.0Valve Type: Schrader ValveValve Length: 32mmTube Material: Butyl Package Include:2Pcs 26” x 4.0 Bike Tubes Note: Before installing, check to see if the inner tubes are completely sealed by putting them in water, if there are any bubbles, they are already damaged. We will provide a 100% refund or Free replacement to you soon. Warm Tips: 1. Please kindly confirm the size of your bike tire before you buy. 2. Before changing the tube, please check whether have some stones or sharp things that may break 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 it. 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. The pressure rating is dependent on the PSI rating of your tire. DO NOT inflate the above pressure rating on the tire!