This high-quality inner tube features a butyl rubber construction that's specifically developed for longer air retention as well as smooth and dependable rolling performance. Schwalbe has also equipped this version with an Extra Light execution, so riders can shave off any unnecessary grams while still enjoying maximum comfort and reliability. Available in a range of valve options to choose from, it offers simple installation and inflation. One final highlight is its also been put through a rigorous testing process to ensure consistently high performance on your ride. Reliable Inner Tube Each tube is inflated at the Schwalbe factory for 24 hours and tested for leaks, which ensures high reliability. Retains Air Longer In manufacturing, Schwalbe ensures a very high butyl content and a very high material purity. So Schwalbe tubes retain air pressure considerably longer. Manufacturer's Part Numbers: 479-10422313 Black/Black Presta 26x1"  479-10519290 Black/Black Schrader 24x1"