http://www.meank-magnet.com/products/permanent-magnets/segment-magnets.html Product Category: neo arc magnets/NdFeB arc magnets/ NdFeB segment magnet/neodymium segment magnets Product Features: rare earth arc magnets, strong magnet segment, powerful segment magnets Available Grade: N35-N54, 33M-50M, 35H-48H,35SH-45SH,28UH-40UH,28EH-38EH,28AH-33AH Surface Treatment: NiCuNi, Zn, NiCu+Sn, NiCu+Ag, NiCu+Au,NiCu+Epoxy, Parylene, Plastic coated, Rubber coated Arc magnet also called as magnetic tile, it is a kind of permanent magnet in tile shape, mainly used on permanent magnet motor. Neodymium arc magnets are the special shape of rare earth permanent magnets. Most of the neodymium arc magnets (neodymium segment magnets)are just produced for industrial production, such as arc magnets for motors, rotor magnets. Neodymium arc/segment magnets are mostly magnetized through diameter.