... a type of modern steel and famous for its high corrosion resistant, wear resistance, strength and hardness qualities among all the stainless alloys ... and, above all, the addition of molybdenum offers greater chemical resistance, particularly in sulfuric acid concentration. All balls can be annealed ... ,G16,G14,G12,G10Any further Information,Plz contact us! 8mm High Quality Stainless steel ball