The Continental MTB 29 inner tube is a premium brand tube fitted with a high-pressure Presta valve. It is made from butyl rubber and features seamless construction, with mould-cured vulcanisation, to ensure uniform roundness and improved reliability at the valve stem. A Continental inner tube makes a great replacement for damaged inner tubes which cannot be fixed with simple puncture repair. By fitting different types of tubes you can actively influence the handling characteristics of your bike with little effort.  Different wall thicknesses and the associated characteristics make this possible.