Magene Exar 700x23-28c Ultralight TPU Inner TubeFeatures: Weighs only 36 grams, which is nearly 100 grams lighter per wheel than a traditional rubber inner tube. 78% smaller than traditional rubber inner tube and is more portable as a spare tube. 8 professional tests have shown that the heat resistance, durability, airtightness and other performance are no less than those of traditional inner tubes. Less friction on the outer tube and rim brings lower rolling resistance Stronger puncture resistance