... ,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 ... (Joann).I'm glad to give you the best service. Aluminum/Brass/POM bearing cage