They are sliced with a bandsaw, waterjet, or CNC machine then widened with a "spacer". This is common practice in custom motorcycle building. I've called one of the largest wheel repair companies in Atlanta and they referred me to a shop in Texas that does it. This was for a aluminum wheel though.
Nearly every after-market product has that disclaimer. Any non-DOT approved product is federally illegal for use on public roads. Find me the DOT stamp on a set of Volk wheels...
Here's a quote I posted on another forum regarding someone saying the same thing about a specific brand of coil-overs:
Originally Posted by speedminded







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