Group 1 - The company, Shandong Dong'a Steel Ball Group Co., Ltd., produces steel balls with diameters ranging from 0.7938 mm to 90 mm, holding over 70% market share in the high-end domestic market for G10Z4 grade and above bearing steel balls and 5-35 mm grade II and above tapered rollers [2] - The company has established strategic global partnerships with eight major bearing manufacturers, including Schaeffler and SKF, and has five dedicated production lines for these collaborations [2] - The company has been recognized as a "leading enterprise" in the high-end bearing intelligent manufacturing industry cluster in Shandong Province and is the largest rolling body production enterprise in the country [3] Group 2 - The company has a state-of-the-art testing laboratory with a building area of 3,600 square meters and the capability to test over 70 rolling body indicators, having received CNAS national laboratory accreditation in 2017 [2] - The company has participated in the formulation of 12 national standards and holds 54 authorized patents, showcasing its advanced technology and testing capabilities [3] - The "Seagull" trademark is the only "China Famous Trademark" in the steel ball industry, highlighting the brand's recognition and reputation [3]