Shandong Donge Steel Ball Group Co,ltd,was founded in 1988(Donge Steel Ball Plant),to manufacture steel ball,tapered roller for bearings of large-scale Private-owned enterprise.The company has more than 2,000 sets of modern steel ball processing equipments ,and 260 sets of testing equipment and more then 2000 workers. "Seagull" brand of steel Ball was granted as excellent products by China Bearing Quality Supervision and Inspection during the last years after testing by Centresample Center,China Beariing Technical Commmittee,It was only "excellent Balls" in steel ball field in China at that time as the domestic industry certification enterprises. It is the largest production company of professional steel ball in China,Company steel balls'quality and efficiency of the country rank is the No.1 in the chrome steel ball industry of China.. In June 1999 and June 2000,Shandong Donge Steel Ball Group Co.,Ltd pasted the ISO9001:2000 certificate,in November 2003 pasted the ISO/TS16949 certificate and past ISO14001 in 2009,Product marketing network is all over the country..