These 1" S1000HM rare earth sphere magnets are very powerful. The magnetic fields of sphere magnets are concentrated more at the poles than disc or block magnets. These neodymium magnet spheres are great for experimentation and magic tricks and are just plain fascinating to handle, but please must use extreme caution because these large spheres are incredibly powerful. The S1000H-HM rare earth magnet has a ruff mat coating that is resistant to scratching. If you want a magnet that has a smoth Nickel plating then you should take a look at our S1000H magnet.