The flying saucer ball: Specification:3.5*5.5,4.5*7. Be widely applid in vibration polishing,aluminum casting,Stainless steel fitting and so on what has the wonderful shape 90° dead angle.The vibration polishing function is equal to steel ball 10 timesChemical composition(%)CSiMnSPCrNiCu≤0.07-0.150.35-0.5512.5-14.2≤0.0230.02713.2-14.50.8-2.01.82