Super Strong Neodymium Magnet Grade N52 3x1x1/2" CMS Magnetics Made of the Highest Quality Neodymium, Iron, and Boron Magnetic Blend Using State of the Art Manufacturing Technology. Grade N52 with 14,400 Internal Gauss and an Extremely Strong Pull Force of 103 Lb per Magnet Ni+Cu+Ni Triple Layer Coated, the Best Coating Available Magnetized Through 1/2", i.e. the N and S Poles are on the 3 x 1" Surfaces. Quality is Guaranteed. Every Magnet is Made Under ISO 9001 Quality Control Standards