Forget the mess and hassle of loose iron filings.This completely self contained and simple to use demonstration set allows for 3 dimensional viewing of the magnetic lines of force.Set includes: - Acrylic cube (measures 7.6cm square) containing iron filings suspended in a silicone oil with a removable cylindrical magnet in the centre.- Flat acrylic rectangle (measures 15cm X 8.9cm ) containing iron filings suspended in a silicone oil.- Horseshoe Magnet - Bar Magnet - Styrofoam Storage Box