This is a spherical magnet with holes made of NdFeB N35 material, also called magnetic beads, magnetic balls, belong to the customized shaped magnets, the diameter can be according to your needs, can be made into bracelets, you can choose to have holes or no holes, scroll down to submit your needs it!
Picture of physical sample of perforated spherical neodymium magnet
There are many similar products, such as round magnet with hole in the center, curved magnet with hole in the center, cylindrical magnet with hole in the center, triangular magnet with hole in the center ......