Schwalbe tubes are designed & manufactured to retain air pressure considerably longer than their competitors. Not only is each individual tube inflated & inserted into a mould to ensure that there is even wall thickness & excellent air retention, they are also stored under pressure for 24hrs to test air retention. Valve length of 40mm for standard version. 

• Durable all metal valve
• Standard tube light at 145g
• Extralight version only 95g!
• Fits all sizes of 20" tires
• Highest quality tube made