Small steel balls with diameter of 1/8 inch (about 3 milimeters) are used in mechanics and magnetism experiments. As a substitute for iron filings for studying the phenomenon of magnetic fields. Form clusters and chains between unlike poles of magnets. Made of polished, hardened spheres.
Iron filing, 12 ounce, in a shaker for convenience plus screw cap for safe-keeping. They are ideal for
experimentation with magnetic fields. When you place these filings on any
magnet, you can visualize 3D magnetic fields. This demonstration is very
common in the classroom and this is your chance to further study the magnetic properties at home.