General description Continental's high-quality butyl tube features a removable valve core, making it ideal for touring, commuting, and gravel riding. Each tube is seamless and mold-cured (vulcanized) to ensure uniform roundness and improved reliability at the valve stem. Every tube undergoes a stringent 100% quality control inspection to guarantee performance. The Hermetic Plus options contain a higher butyl content and wall thickness, which helps retain air longer and enhances puncture resistance. Technical specifications Size: 26 x 1.3-1.75 inches Valve type: Presta 42mm