... Materials: AISI E52100Grade: Grade10 to Grade1000 Size:1/4"Complying to: ISO3290 reasonable pricechrome steel balls ... Type 52100 Chrome Steel Balls SIZE RANGE0.50mm (1/32") up to 1-1/2" GRADES:, 10, 25, 50, 100 ... , 2000 CHEMICAL COMPOSITION CHROMIUM1.30% TO 1.60% CARBON.98% TO 1.05% MANGANESE0.25% TO 0.45% ... SILICON0.15% TO 0.35% PHOSPHOROUS0.010% MAX. SULPHUR0. ...