These brush pens give outstanding results and feature professional-quality, self-wicking brushes, and acid free, blendable, permanent ink. Perfect for watercolor painting, card-making, scrapbooking and more. This package contains twelve watercolor brush pens in a variety of colors and one empty blending brush and all nine pens come in a reusable vinyl case (7-1/2 by 7-Inch). Conforms to ASTM D4236. Non-toxic.