This is a rare earth, Neodymium Magnet of which we know are the strongest kind you can get!
This disc magnet measures 30x5mm, and can be used for a variety of applications, including science fair projects and experiments requiring a particularly strong magnet.
Type: Neodymium - Nickel Coating.
Please note: If you are handling these magnets with other Neodymiums, never let them attract together from a distance. They are incredibly strong and can often shatter on impact - on that note. Its also a very good idea to handle with care as getting any fingers or skin pinched between these magnets can hurt!