Continental standard weight presta valve tubes.Seamless and mold cured constructionItem SpecificationsWeight105gValvePrestaISO Diameter622 / road / 29"ISO Width18,19,20,21,22,23,24,25mmLabeled Size700 x 20-25ccValve LengthLong 56-74mmTube CompoundButylValve CoreRemovableValve ShaftThreaded