Please read We proudly offer Magene TPU tubes, backed by our confidence in their exceptional quality. Having personally visited their factory, we've witnessed firsthand the meticulous manufacturing process Magene employs. They craft their own valve stems in-house and utilize premium TPU material for tube construction, ensuring durability and performance. IMPORTANT- The area around the valve stem has also been also reinforced, as this is a usual area of failure on TPU tubes. See photo for the difference in quality! Also included is a 3M rubber valve isolator to help prevent that dreaded valve stem rattle against your rim. Slide it over your valve stem after the tube is installed and stick it on the rim. We love the small details this brand comes up with! Take a look at the attached photos showcasing the weight variance between standard butyl tubes, lightweight butyl tubes, and Magene EXAR TPU tubes. Weighing in at just 36g, Magene EXAR TPU tubes can significantly reduce rotating weight on your wheel-set, potentially saving over 150g—equivalent to 1/4 lb! While there may be lighter and cheaper alternatives available, we prioritize customer satisfaction and opt to steer clear of those brands. With Magene, we've found the perfect balance of performance, weight, and reliability. Experience the difference for yourself—try a pair of Magene TPU tubes today!