1 pack Grade N42 NdFeB Magnet Disc Dia. 6x1 mm 0.236  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