Neodymium magnets are the world's strongest block magnets. All magnets are not created equal! Applied Magnets offers the highest quality neodymium magnets with consistent performance at lowest price. Our strong neodymium magnets are designed & manufactured to meet stringent quality standards using the latest technology. Neodymium magnets (also known as Neo, NdFeB, NIB or super magnet) , a type of rare earth magnets, are the permanent magnets made from neodymium, iron, boron and other minor elements. Super strong neodymium block magnets grade N42, stronger than N40, N38 and N35 BrMax: 13200 gauss Neodymium Block Magnets N45 1.5 inch x 1 inch x 0.25 inch Thick Rare Earth Magnets Nickel+Copper+Nickel triple Layer Coated for maximum neodymium block magnets durability and protection against corrosion. Magnetized through the Thickness 0.25", poles are on the two 1.5 x 1 surfaces Approximate magnet pull force: over 38 lbs These neodymium block magnets are very powerful, make sure you read safety warning before purchase.