Silver Fox Brushes are made from the guard hairs of Silver Fox. They produce ultra-fine tips. I mix these with about 5% double dressed goat hair on the bottom part of the brush to help them be a little more springy without affecting the tip. The ultra-fine tip they produce is unique and unmatched. Shorter bristle lengths are excellent for Calligraphy and Lettering, and longer bristle lengths are excellent for ultra fine organic curves and lines.