... 4.Certificate:ISO9001:2008 5.Coating:Ni Zn etc 64 1/4" CUBE MAGNETS N42 Neodymium rare earth + bag + magnetic 64 ... in a box! 1. Materials Neodymium magnet 2. Grades N33-N52 33M-48M and so on3. Shapes Others available: Block, Cylinder, Block, Disc, Arc ... , wind turbine,wind generators, speakers, loudspeakers, magnetic filters, etc. 64 1/4" CUBE MAGNETS N42 Neodymium rare earth + bag + magnetic