Here is a nice article explaining how Forgeline wheels are made. I'm sure HRE's are basically the same. Great wheels but make sure there's lots of room on your Visa card!
http://www.stangtv.com/tech-stories/wheels-tires/faster-lighter-stronger-look-forgelines-monoblock-wheels/
http://www.stangtv.com/tech-stories/wheels-tires/faster-lighter-stronger-look-forgelines-monoblock-wheels/
