... Specification :Model No: 688RS bearingSize: 8*16*5mm Bearing material: copper Product Feature:1.Low coefficient of product,reduce ... 60,62,69,68,6000series, and non-standard bearing series,toy bearing series and sport equipment series.Roller:all kinds ... produce miniature deep groove ball bearing or carbon steel, bearing steel, stainless steel, non-standard bearing and injection molding roller and ...