Neodymium Disc Magnet 40 x 5 mm N35
 
Neodymium (NdFeB) is among the strongest magnetic materials, even in small sizes, and its stability makes it useful for many practical applications. It is noticeably stronger than conventional ferrite magnets and generally has a protective coating because the material is prone to corrosion. The N35 magnet belongs to the NdFeB family, commonly ranging from N35 to N52; a higher number generally means greater magnetic attraction.
 
This size provides substantial magnetic attraction and is suitable for strong attachments and professional use, with careful handling. The actual hold depends on the contact surface and the thickness of the metal. Holding force is greater on thick steel than on thin sheet metal.
 
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 bank cards, sensitive electronics and medical devices.