Our factory has established for decades and expert in all kinds of high quality steel balls. And we have passed ISO, SGS and other certificates. Our ball sizes: 0.5mm--50.8mm Our ball material: stainless steel (AISI 201, 304, 304L, 316, 316L, 420, 420C, 430, 440, 440C. ) chrome steel, carbon steel.Our ball grade: G10--G1000 Our products are doing great in many markets including USA and Europe, Middle-East, Africa etc.