Marathon tires incorporate light-reflecting sidewalls for better visibility and also utilizes a Silica compound for easy rolling and longer life.GreenGuard is a highly elastic, India rubber that is 3mm thickOne third of GreenGuard is made up of recycled latex productsEndurance compound for durabilityKevlar-MB belt puncture protection using a combination of natural rubber and Kevlar fibersReflex sidewalls incorporate light-reflecting bandsItem SpecificationsWeight730gPSI55-100PSITire BeadSteelISO Diameter559 / 26" mtnISO Width40mmLabeled Size1.5Color Tread/SideBlackTire TypeClincherTire Diameter26"Intended UseMountainDefined ColorBlack