From the manufacturer's official website:

Features:

• Nominal Weight: 50 g. (32 mm.) / 55 g. (60 mm.)
• Multi-size tubes allow greater compatibility with more tire sizes, and fewer tubes.
• Unitubes are available in both Schrader and Presta valve tubes. Presta valves are available in a variety of lengths.
• All tubes are seamless and mold-cured (vulcanized) to ensure uniform roundness and improved reliability at the valve stem.
• Each and every tube passes a stringent 100% quality control inspection

Continental's large range of exclusive race tires is matched by an equally interesting range of tubes. There are normal butyl tubes as well as lightweight and ultra-lightweight tubes.

For more information, please visit this product's webpage.