A Pinstriping brush is the tool of traditional free hand pinstripers use for pin striping. Freehand pinstriping is the most difficult method of pinstriping and the brush is an important tool for design. Pinstriping brushes have several different designs, Swords, Daggers, and Flats, as well as Double line brushes. The brush consists of a small wood dowel handle, string or brass fixture with adhesive and brush hairs traditionally made from squirrel hair.