Simply Science Mysterious Magnet Tube, with steel filings

Explore beautiful 3-D patterns created by a magnetic field - mess free! Sealed plastic display tube (now scratch resistant!) enables clear, 360-degree viewing. Keeps filings clean and safe. Just insert the magnet into the center chamber. Includes display tube with encased steel filings, Alnico cow magnet, and multilingual activity booklet. Package measures 5.13"H x 3.5"D.