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Continental Race 28" 700x20-25 Bicycle Inner Tubes. 80mm Long Presta Valve (Pack of 5 Tubes) - Continental bike tubes are constructed of durable butyl rubber and are 100 percent inspected to ensure quality. The tubes are seamless and vulcanized for uniform roundness and improved reliability. Material: Butyl tubes with renowned Continental quality - Durability: Each and every inner tube passes a stringent 100% quality control inspection - Design: Seamless Construction, with a mold-cured Vulcanization, to ensure uniform roundness and give a Smooth Ride and Handling