... , we begin distiguish configuration . NYLON , COPPER , ROLLER BALL BEARING. picture five:XK-450 rubber mixing mill . two configuration , stock ... the style is generous and beautiful.4.Roller bearing is using MC nylon bearing, with ZFG3, ZFG4 calcium complex grease, ... have any questions!Best regards! We are Qingdao Yahua Machinery CO.,LTD. Our main products are plate vulcanizing machine, curing press, ...