Metal, Metals Mixed, Non Ferrous, zhejiang shangyu yuanyuan steel ball, mainly produce china steel ball, stainless steel balls(440C, 304, 316L, 420, 430), carbon steel balls(1015, 1045, 1085), bearing steel balls(GCR15), copper balls, glass balls, titanium balls, flying saucer balls, polishing balls; kinds of hard alloy balls. it is widely applied in the hardware goods which form a complete set for the aviation and spaceflight, Bearings ...