Description:Steel Bearing BallMaterial: 304 Stainless SteelTolerance: ±0.02mm1/2/3/4/5/6/7 mmPackge included: 50/100 PCSHigh precision, nice wear resistance, high temperature resistance, high toughness, corrosion resistance, high rigidity, non-magnetic, electrical insulation, smooth and clean surface.for Bearing/pump/linear Slider/valvs Ball.