All Metzeler tubes are made from natural rubber blend and feature heavy-duty construction for excellent service and puncture resistanceFor Valve Stem Types, see page ??? FOR RIM SIZE18?INNER TUBE VALVE STEM TYPE EU34G| TR-4| V1-09-1INNER TUBE VALVE STEM TYPE USSMV Side metal valve (threaded and nuts)MATERIALRubberPRODUCT NAMEInner TubeTUBE FITS TIRE SIZE240/40-18| 280/35-18| 300/35-18TYPEMotorcycleUNITSEach