Stays clear! Steel filings are sealed in a scratch-resistant, transparent viewing tray. Includes rubber coated magnets (.75" disc magnet and 1" bar magnet) and filing-filled tray measuring 3.44" D.

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 : Includes 2 magnets (.75" disc magnet and 1" bar magnet) and filing-filled tray
iv : Magnets are rubber coated to prevent scratching on the outside of the tray too