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The bushing has 3 types,which is made of steel( it can made of other material ,just like ceramic,plastic etc.)
NO 1: Plastic bushing (blue,white colour;NO 2:Aluminum bushing(white,cupreous colour);NO 3:Copper bushing(copper-colored).
Also each type with the Standard Kind,the Compact Kind and the Ultra-compact Kind.The compact Kind has more steel balls than the Standard type with the same specifications, it is more reliable when comparing the service-life and abrasive resistance etc. While the Ultra-compact Kind has the most steel balls.


