da Vinci Series 450 Black Goat Watercolor/Gilder Duster Oval Quill Paintbrush, Size 0 (450-0) Has a similar softness to squirrel hair watercolor brushes for a fraction of the price Black goat hair is highly absorbent for water and color Generously sized and hand shaped, the quill is excellent for wash and mop techniques The unique shape of the Quill Mop makes it ideal for oil gilding and gold or metal leaf work Also see Series 410 Certified green manufacturing with sustainable wood handles; Made in Germany