... 625ZZ bearingSize: 6*40*9mm Bearing material: carbon steelProduct Feature:1.Low coefficient of product,reduce tire ... advanced technology production Material Option:1.Bearing Material:carbon steel,chrome,stainless steel,iron,copper,ect.2.Roller ... is mainly produce miniature deep groove ball bearing or carbon steel, bearing steel, stainless steel, non-standard bearing and injection molding roller and ...