1.low carbon steel ball 2.ISO 9001 3.Steel Ball SS440C, SS420, SS316L/316 4.High precision & trustworthy quality ... material AISI304, 316, 420C, 440C2. Steel ball, with material AISI 1008-1086.3. Chrome steel ball,with material: AISI521004. Flying saucer steel ... are widely used in several industries, such as hardware, sliders, ball bearing lead screw, wheels, toys, bicycles, bearings, trust bearings ...