... coefficie Micro ball retainersbearingBest in quality linear ball cages in different types and specifications for your choice, also called ball bearing cage,ball bearing bushing ,& ball bearing bush,ball retainer ... colour,ALBS,ALS,ALBM,ALM,ALBT,ALT type );NO 3:Copper bushing(copper-colored, CUS,CUM,CUT type).Also each type with ...