Disc Balls Application Fields: Stainless steel disc balls are primarily used for deburring and polishing various metal hardware, especially effective for irregularly shaped workpieces. Due to their appearance resembling a flying saucer, they are called disc balls or flying saucer balls. Characteristics: Disc balls are mainly made of carbon steel, 201 stainless steel, and 304 stainless steel. Standard sizes are typically ￠3.5×5.5, ￠4×6, ￠5×7, and ￠7×10, with custom non-standard sizes available.