Magnetic Field Cube

View magnetic fields without the messiness of iron filings! Vigorously shake this handy acrylic cube to disperse the iron filings suspended in solution within it. Then easily view the created magnetic fields using the included magnets marked "N" (north) and "S" (south), which can be removed from the cube's hollow center.
The cube is durable enough to pass around your classroom, or place it on an overhead projector for display to a large group. Cube is 3" square.