These Aqua Flow Pens are uniquely designed to create vibrant watercolor effects without the mess or hassle. These highly pigmented water-based pens complete your designs with a bright and colorful finish. The watercolor brush nib is perfectly formed and smooth to use, making this incredibly versatile pen perfect for adding small detail or color washing larger areas. Each pen has its own reservoir complete with non-drip valve, so you don't need to worry about it leaking in storage.