... /G60/G100/G200 3,size:2mm-60m Bearing steel ball Production nameG28,G40,G100-G1000 high precision bearing steel balls size2MM-60MMGradeG28,G40,G80,G100 ... balls are case-hardened only(surface heat treatment),low carbon steel balls offer considerable saving in all those applications which do ... ,sliding,blocks,toys.Any further Information,Plz contact us! AISI52100 ,GCR15,100Cr6 chrome bearing steel balls