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The hair is actually one I bought from tony at the golden nib to use in this brush. It is one of the hand tied ones from the UK maker. As for the ones Don uses, I am not sure where he gets them.
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Coming my way real soon...

http://straightrazorpalace.com/members/zethlent-albums-brushes-picture2593-don-mcivor-japanese-horse-chestnut.jpg