These are ULRTA SMALL 1mmx1mm magnets and should be be kept away from children due to the small size. Care should also be taken not to lose the magnets since they are nearly the size of a grain of sand! Neodymium magnets (AKA Neo, Rare Earth, NIB, NdFeB), invented in the 1980s, are the strongest and most affordable type of rare-earth magnet. Made of an alloy of neodymium, iron and boron (Nd2Fe14B). Used in numerous applications requiring strong, compact permanent magnets, such as electric motors, hard drives, magnetic hold downs, jewelry clasps and power generation (wind & hydro turbines). They have the highest magnetic field strength and have a high coercivity (which makes them magnetically stable).Strong enough even to pin a A4 paper. Universities or research labs sometimes request such small magnets, for instance to secure tiny parts under the microscope. These magnets are incredibly strong for their small size and work great for crafts, repairs, hanging items on your fridge, etc. Package includes: 10pcs x Neodymium Magnets
