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 SIZE16?INNER TUBE VALVE STEM TYPE EU34G| TR-4| V1-09-1INNER TUBE VALVE STEM TYPE USTR-4 (round base) Center Metal Valve (threaded and nuts)MATERIALRubberPRODUCT NAMEInner TubeTUBE FITS TIRE SIZE110/90-16| 120/90-16| 130/90-16TYPEMotorcycleUNITSEach