Nuvo Aqua Flow pens are uniquely designed to create a watercolor effect without the hassle and mess. these highly pigmented water-based pens leave you with a bright, vibrant finish. The perfectly formed watercolor brush nib makes the pens extremely versatile and is perfect for adding small detail or color washing large areas. Each pen has its own reservoir complete with a non-drip valve. This 4x8.5 inch package contains three watercolor pens. Conforms to ASTM D4236. Imported.