The highest quality tubes on the market where quality and performance is consistent among the whole range. The Ultralight tube is a top level tube which is 0.6mm thick - it's plenty light for racing and hill climbing but excellent for durability and extra protection. At only 68g these are still one of the lightest butyl tubes on the market (see the Flyweight if you want superlight) but they are reliable and durable for everyday riding. Valve length is
Available in 700c x 18/25C with a 38mm valve length.