Neodymium Disc Magnet 6 x 3 mm N35 Diametrically Magnetised
 
Neodymium (NdFeB) is among the strongest magnetic materials, even in small sizes, and its stability makes it useful for many practical applications. Its magnetic attraction is much greater than that of ferrite magnets, and a surface coating protects it against corrosion. N35 indicates the magnetic grade; a higher number generally means a stronger magnet, with grades commonly ranging from N35 to N52. Diametric magnetisation is useful in certain applications, such as rotating components. Check the orientation before installation.
 
The Ø6 × 3 mm size is suitable for DIY projects, small holders, catches and temporary attachments to steel. The metal material and thickness strongly affect performance. A thicker, flatter surface gives a better hold.
 
Warning: keep away from children. Two magnets can snap together quickly, pinch fingers and crack or chip. Use spacers for storage and take care when separating them. Keep them away from medical devices and objects sensitive to magnetic fields, including cards and electronics.