ART IFACT 5 Pieces of 40mm x 20mm x 4mm Neodymium Magnets - N52 Rectangular Magnets - Rare Earth NdfeB Magnets - For DIY, School Project or Commercial Usage Fridge Magnet, Multipurpose Office Magnets, Magnetic Paper Holder Pack of 5  (Silver)

5 Pieces of Neodymium magnet of Rectangular / Block shape N52 Magnets with height of 40 mm, width of 20 mm and thickness/height of 4mm, coated with Nickle (Ni-Cu-Ni). Each magnet's North and South pole are on opposite sides of 40mm X 20mm faces. Rare earth neodymium magnets, also known as NdFeB magnets or Neo Magnets, are made from an alloy of neodymium, iron and boron. They are extremely strong even in small sizes. Neodymium magnets are permanent, and have a high maximum magnetic energy.