... ,white colour,POMS,POMBS,POMM,POMBM,POMT,POMBT type;NO 2:Aluminum bushing(white,cupreous colour,ALBS, ... Copper bushing(copper-colored, CUS,CUM,CUT type).Also each type with the Standard Kind,the Compact Kind ... Kind has more steel balls than the Standard type with the same specifications, it is more reliable ... glad to give you the best service. ball cage, ball retainers of brass for mould accessories