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Try the Vie-Long horse-hair options from Gifts & Care in Spain. Two general variants there: 2:1 tail-to-mane ratio (brown hair) and 1:1 tail-to-mane ratio (white hair and banded hair). Of the two,...

That was my sense in viewing the picture as well. I have Turkish boar brushes that look like those, not horse. Very nice brushes, by the way.