... causing by rolling contact and side damage on machine parts and prolong service life.6.sound ... white colour,POMS,POMBS,POMM,POMBM,POMT,POMBT type;NO 2:Aluminum bushing(white,cupreous colour,ALBS ... (copper-colored, CUS,CUM,CUT type).Also each type with the Standard Kind,the Compact Kind and the ... compact Kind has more steel balls than the Standard type with the same specifications, it is more reliable ...