The michelin airstop butyl 26 inch tubes airstop butyl tubes answer the needs of everyday cyclists for economical high quality inner tubes airstop butyl tubes offer excellent puncture resistance and the consistently high quality for which michelin is famous unlike many other manufacturers michelin use a very high level of butyl in the compound of their tubes virtually eliminating any air michelin airstop butyl 26 inch tubes features butyl tubes offer excellent puncture resistanc