Docrafts-Artiste Watercolor Dual Tip Pens: Brush & Marker. Perfect for rubber stamps, painting and blending! Vary pressure to alter thickness of line. The brush tip creates fluid lines and the marker tip creates consistency when coloring. This package contains twelve double-tip watercolor pens in an assortment of colors on one 6- 1/4x5-1/2x3/4 inch container. Acid free. Non-toxic