Applied Magnets 4" x 1/2" x 1/2" Strong Neodymium Block Magnet The Applied Magnets Super Strong Neodymium Magnet is one of the worlds strongest and most powerful rare earth magnets. We manufacture every piece in state of the art ISO certified Magnet manufacturing facilities to ensure maximum quality. STRONG - Includes 1 Neodymium Rare Earth Permanent Magnet Block with an incredible Grade N45 Magnetic Energy, stronger than N42, N40, N38, N35, and a whopping 10x Stronger than the strongest ceramic magnet. POWERFUL - Applied Magnets Rare Earth Neodymium Magnets have an estimated pull force of 75 lbs. and are triple layer coated (nickel-copper-nickel) for maximum durability and protection against corrosion. USEFUL  Use your rare earth magnet for just about anything, including finding studs in your wall, re-magnetizing old magnets, various projects & presentations, education, & more. NASA even uses them on Mars Exploration Rovers! SATISFACTION GUARANTEED  Were confident that youll love our Neodymium Permanent magnets, which is why were happy to include a 100% satisfaction, 30-day guarantee with your neodymium order.