The Michelin Airstop Tube is a .9mm thick butyl tube designed for increased puncture resistance..9mm thick butyl tube for increased puncture resistanceItem SpecificationsWeight166gValveSchraderISO Diameter622 / road / 29"ISO Width36,37,38,39,40,41,42,43,44,45,46,47,35mmLabeled Size700c x 35-47Valve LengthSchraderTube CompoundButylValve CoreFixedValve ShaftSchrader