... because it is used in so many styles of good quality brushes for a variety of tasks.Red Sable, ox, and Camel hair ... oils where blending and texturizing are of primary importance.2. BristleBristle is a stiff hair derived from a hog, pig, or boar. Its ... and appear on lesser quality brushes.In some brushes, a flexible natural or plastic quill is used in place of a metal ferrule.