Odd-shaped magnets make odd-shaped magnetic fields. This kit has seven very powerful neodymium rare earth magnets in seven unusual shapes. When placed near or on top of the included magnetic field viewer containing iron filings, the iron filings line up in amusing patterns. The 2.5″ x 3.5″ viewer is sealed so the filings won’t spill or stick. Shapes included: bar, star, heart, disk, triangle, ball and ring. With 3/4″ x 4″ keeper and instructions.