... (blue,white colour,POMS,POMBS,POMM,POMBM,POMT,POMBT type;NO 2:Aluminum bushing(white,cupreous colour,ALBS,ALS,ALBM ... ,ALM,ALBT,ALT type );NO 3:Copper bushing(copper-colored, CUS,CUM,CUT ... type). Advantage1)We provide different mould accessories ,you can choose ... I'm glad to give you the best service. Chinese linear bearing