... of steel ball Materials: AISI E52100Grade: Grade10 to Grade1000 Size:1/4"Complying to: ISO3290 reasonable pricechrome steel balls made of ... RANGE0.50mm (1/32") up to 1-1/2" GRADES:, 10, 25, 50, 100, 500, 1000, 2000 CHEMICAL COMPOSITION CHROMIUM1.30% TO 1.60% CARBON ... .98% TO 1.05% MANGANESE0.25% TO 0.45% SILICON0.15 ...