Buy Electromagnets Kits online with Bunting – eMagnets™. Electromagnet Kit – This fascinating kit allows you to build a doorbell, telegraph system and even a catapult all using a true electromagnet.Kit includes: disc, latch and neodymium magnets, compass, straws, wires, sand paper, switch plates, wood screws, nails, light bulbs, battery holders, iron filings, pre-drilled wood blocks and light emitting diode (LED). Comprehensive activity book includes 6 experiments and 6 projects. For Ages 10 and up.