Magnetic Field Viewing Kit with Steel Filings, Pack of 3

Mess-free! Steel filings are safely sealed in a scratch-resistant, transparent viewing tray for your investigations. Each kit includes rubber-coated magnets (0.75" disc magnet and 1" bar magnet) and filing-filled tray measuring 3.44"D. Sold as a pack of 3 kits. Ages 8+/Grades.Key Features : i : Clear viewing of the invisible lines of a magnetic field!ii : Steel filings are sealed in a scratch-resistant, transparent viewing tray.iii : Magnets are rubber coated to prevent scratching on the outside of the tray too.iv : Each kit includes 2 magnets (.75" disc magnet and 1" bar magnet) and filing-filled tray.v : Sold as a pack of 3 kits.