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IF and WHEN he actually does make these brushes, the first batch will be made in a small quantity and when they're gone, it will be special order only. They'll be expensive and even more expensive when on special order (Richards words, not mine).
With poles getting lighter and much more rigid than they used to be, and plenty of good light brushes on the market already, I don't see the point myself in paying the extra money for a carbon brush.