Kolinsky sable-hair brush
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A Kolinsky sable-hair brush (also known as red sable or sable hair brush) is a top-of-the-line, valuable fine artists' brush.
The hair is obtained from the tail of the kolinsky (Mustela sibirica), a species of weasel rather than an actual sable. It is pale red in colour with darker tips. The hair has special qualities unmatched by any other: strength, slenderness, and great resiliency.