"The full belly of the male Kolinsky in these brushes allows greater control and fantastic fluid capacity.The brush fibers are hand-shaped with extreme care and triple crimped to the Italian hardwood handle, which is finished with five coats of lacquer. Your satisfaction is guaranteed. If at any time you are dissatisfied with the craftsmanship of any Master brush, return it to Blick for replacement or refund. Lifetime Guarantee — When properly used and properly cared for, Blick Master Series brushes will last a lifetime. If at any time you are dissatisfied with the materials or performance of a Master Series brush, you may return it to Blick for a replacement. Note — These brushes may have either a silvertone or goldtone ferrule." -Blick

This brush is made with natural hairs or fibers.

Natural