Paul Babcock discussed this core material a long time ago starting with an interview I did with him near the time of our first conference. You can search my channel for Paul Babcock and related interviews: Paul Babcock
This is a very simple and effective way to make a core for an electromagnet that has very fast switching times and this is important if you want the oscillatory transients to have the highest possible voltage – this is what most people call the “spike”.
The video shows an entire how-to on this method – it could have been a 5 minute video, but I decided to just show the whole thing to answer any possible questions.
Please visit http://magneticenergysecrets.com for Paul’s presentations that disclose the workings of his motor and switching technology – his motor uses this exact same core material.