I have to wonder what the point is for a disc they're not submitting for PDGA approval. They've got release numbers by color and plastic and everything.
http://www.herodiscusa.com//catalogsearch/result/?q=xb
XB Experimental Disc
The XB features a unique flight plate design. The idea was to create a design that among other things was geared towards lighter and faster discs. The original design mindset was to augment Japan Open Class (152g ~ 159.9g) with 'XB' mold characteristics. Innova planned on releasing the design but decided to take a new direction.
http://www.herodiscusa.com//catalogsearch/result/?q=xb
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