Gilley Coil (Electromagnet Kit ) (511) Experiment with induced currents, reversed polarity and magnetic lines of force. Kit includes 2, 350 turn copper coils with 2 binding posts on each coil; 1 round iron core; square iron core; 2 half-round iron cores; "U"-shaped double core; plastic card; 4 color-coded leads with alligator clips; iron filings in reusable jar; instruction booklet. Operation requires 6 volt dry cell or lab power supply (not included) Qty :