The rod magnet is made of rare earth neodymium element, the specific size is that 4mm in diameter, 20mm in thickness. The surface coating color is nickel with silvery white, but Epoxy, Zinc, Gold, etc coatings also are available to choose. Neodymium is easy to be oxidation and corrosion. The plating is in order to reduce this occurrence. Therefore, many customers will choose neodymium magnets because of its high performance and the disadvantages is reduced risk through coating.
The surface of this magnet is smooth, long life (in the normal use of the product can ensure that the magnet life will not decline earlier than the product), the suction is strong and permanent, can be adsorbed across a certain thickness of the table, can be recycled, and not easy to demagnetize. It is widely be used in model making, craft, hardware products, decoration, home appliances, electronic products, precision instruments, medical equipment, etc.
The display of axially magnetized 4 x 20mm Strong Neodymium cylinder rod magnets:
Other 4mm diameter magnets;