... for your choice, also called ball bearing cage,ball bearing bushing ,& ball bearing bush,ball retainer & Die parts & die fittings for ... can made of other material ,just like ceramic,plastic etc.)NO 1: Plastic bushing (blue,white colour,POMS,POMBS,POMM,POMBM,POMT,POMBT ... type;NO 2:Aluminum bushing(white,cupreous colour,ALBS,ALS ...