... steel (SUS420J2, AISI304, AISI316, AISI316L, AI Features:1) Re balls: chrome steel, stainless steel (SUS420J2, AISI304, AISI316,AISI316L, AISI440C ... G1000, Ti alloy balls, K-Monel balls, soda-lime glass precisionballs, tungsten carbide, and grinding media2) Re rollers and needles, ... we mainly supply chrome steel in G5, G3, G2 bearing Balls