VERY STRONG Small Mini Neodymium Disc Magnets 4mm x 0.5mm Rare Earth Magnets
N numbers range from N27 - N52. Very Strong Mini 4mm x 0.5mm Disc N35 Neodymium Magnets. Neodymium is about as common as tin or lead. Neodymium Magnets. Never allow magnets to jump together or to jump to steel as they will likely shatter.