Create, draw, color, and more! The doodlerz dual brush pen features a double ended design with a flexible brush tip for thick and thin strokes and a bullet tip for writing and underlining. A water-based ink allows for watercolor effects when using them with a paint brush or water brush pen. AP certified non-toxic. This package contains 18 dual brush markers in assorted colors. Conforms to ASTM D 4236. Imported.