The size is from 0.5mm to 4", the material would include low carbon balls - AISI 1015, High carbon balls- AISI 1085, High carbon Chrome balls SAE 52100, all kinds of stainless steel balls, AISI 302, 304, 316, 316L, 440C, 420ss, 420C, etc. The grade would be G10 - G1000. The balls would be used in bearings,