This is one of the best and most fun projects to date. The electromagnet arm bracer is wicked powerful. The electromagnets are available on Amazon. Each electromagnet is rated for 1200N (260lbs) at 12v. We have been running them at 72v for an estimated total force of 14400N (over 3000lbs). Yeah, that is enough force to rip your arm off and then sucker punch you with said severed arm. At 6x the rated current, the electromagnets over heat quickly and can only be run for short periods of time. It uses a set of lithium-polymer batteries from Hobby King running in series. To holster the shield on the back of the jacket, we used to neodymium magnets from amazon . These things are scary powerful but super fun to play with. If you get your own, be careful because they will crush your hand!!!