Case of 10 Tubes Continental Race Light 700c x 18-25mm 42mm PV. Case of 10 Tubes Continental Race Light 700c x 18-25mm 42mm PV. Note: This is a case = 10 Tubes ! 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. Weight: 69.5 g Removable valve core