Grade N45 neodymium, iron, and boron magnetic alloy blend. This magnetic blend is patent licensed and made under the ISO 9001 quality systems. Material: Sintered NdFeB. Grade N45 Gauss Rating: 13,500 Gauss Pulling Force: 8.7 lbs. Pole Orientation: Axially magnetized, the poles are on the flat surfaces. Coating: Ni+Cu+Ni triple layer plated, the best coating available Tolerance: The tolerances of all the dimensions are +/-0.002in with coating.