The Magnetic Field Viewing Cube is a striking new way for students to observe magnetic field lines - in 3D! Even students who have seen magnetic fields demonstrated on a two-dimensional plane will be fascinated. Save yourself the mess of loose iron filings with this sealed, transparent acrylic box. Simply shake the oil-filled cube, drop the cylindrical magnet (included) into the center compartment, and watch the iron filings respond to the magnet's presence. Durable enough to allow students to handle individually or use it with an overhead projector to share with a large group. Countless opportunities for experimenting with variables. Cube measures 3 x 3 x 3 inches.