1,high quality rubber 2,suitable for otr tire 3,high quality certification 4,good sales service 5,best price ... Motorcycle Inner Tube 3.00-18 With High Quality Rubber Materials 1, Main Technical Parameter: MODELTUBE VALVESWEIGHTMODELTUBE VALVESWEIGHT250-17TR4340g400 ... and tube blending machine,ect are most advanced here.All raw material of inner tube are good quality.Experienced engineers ...