... performance WELCOME TO YUANCHENG BEARING CO.,LTDProduct Specification :Model No: 683ZZ bearing Size: 3*7*2mm Bearing material: carbon steelProduct Feature ... 62,69,68,6000series, and non-standard bearing series,toy bearing series and sport equipment series.Roller:all ... miniature deep groove ball bearing or carbon steel, bearing steel, stainless steel, non-standard bearing and injection molding roller ...