The Extra-Light delivers the usual quality and reliability of the standard inner tube at a reduced weight. Schwalbe inner tubes have proven themselves on the market for years thanks to their excellent manufacturing. They are uniform in wall thickness and round in the barrel. Their precise seams make them durable. A comparative test showed that the Schwalbe inner tube keeps the air pressure stable for significantly longer than other inner tubes, which lost almost twice as much air pressure in 30 days. One possible reason for this could be a lower butyl content in the other tubes. The special quality of Schwalbe inner tubes results from the uniqueness of their rubber compound. To guarantee this high quality, every single Schwalbe inner tube is inflated and checked for at least 24 hours before it leaves the factory.