For tpu Road Bike Inner Tube Ultralight 28g Fits 700C Tires 23C 25C 28C 30C 32C
Only 28g ,inner tubes are 70% and 50% smaller than butyl rubber inner tubes, and at only 0.21 lbs, they can be easily carried for unexpected situations. Weight ：28g (士3g). Materials : for tpu. For rim brake and disc brake wheelsets.