carbon steel balls(AISI1010-1015,AISI1045,AISI1085 G28-G1000,2MM-60MM),and chrome steel balls(AISI52100 G40-G1000,2MM-60MM) and stainless steel balls(AISI304,316,420,440 G100-1000,2MM-25.4MM)
they are widely used in many fields such as auto,motorcycle,bicycle,bearings,aviation and precision instrument and medical instrument and etc.
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