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 SIZE17?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 SIZE160/70-17| 170/55-17| 170/60-17| 180/55-17| 190/50-17| 200/50-17| 210/50-17TYPEMotorcycleUNITSEach