1 pack Grade N42 NdFeB Magnet Disc Dia 5x10 mm 0.2  Diametrically Magnetized Strong Neodymium Permanent Rare Earth Magnets 1 pack diametrically ndfeb magnet ring diameter 9 53x3 18x3 18 mm 3 8 1 8 1 8 tube magnetized neodymium permanent magnets