Neodymium Disc Magnet 20 x 20 mm N48
 
A neodymium magnet (NdFeB) is small but very strong. It is made from a special alloy and magnetised in a strong magnetic field during manufacture. It is noticeably stronger than conventional ferrite magnets and generally has a protective coating because the material is prone to corrosion. The N48 magnet belongs to the NdFeB family, commonly ranging from N35 to N52; a higher number generally means greater magnetic attraction.
 
The larger design suits demanding applications, including attachments with high magnetic attraction, grippers and professional projects. The metal material and thickness strongly affect performance. A thicker, flatter surface gives a better hold.
 
Warning: not suitable for children. Strong magnets can snap together suddenly, causing pinching injuries, and may break. Bring them together and separate them carefully. Keep them away from medical devices and objects sensitive to magnetic fields, including cards and electronics.