These sets either have a small visual imperfection or something slightly wrong with the setting of the weave in a piece. We know it is there so it doesn't meet or pretty strict QC standards.
Definitions are as follows:
"A" set is excellent weave and surface.
"B" set is very good weave and surface. 1-3 pieces of the set may have a few imperfections that can be found by examining the piece close up, but not obvious when installed.
"C" set has visible imperfections that can be seen while sitting in the car.
I do not have any pictures of the imperfections as these 'B' sets sell quickly. If you need references I can forward you to some users that purchased from our last 'B' set sale and you can ask them for their impressions.
There are no 'C' sets available for purchase. The grade was included for the possibility of such an imperfection.
Here is a review from a client with a 'B' set:
http://www.audizine.com/forum/showthread.php?t=204128
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