Bearing cage *Certificates:ISO9001 *Material:Bronze,Aluminium,POM; *Size:Customized; *low friction coefficient Bearing cageFeatures1. low ... ,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,ALBM,ALM,ALBT,ALT type );NO ... give you the best service. Aluminum/Brass/POM bearing cage