The Aqua Flow Pens are uniquely designed to create stunning watercolour effects in a variety of vibrant colours without the mess or hassle. These bright water-based pens offer highly pigmented and colourful inks which seamlessly absorb into the paper for a smooth watercolour finish. The synthetic watercolour brush nib is perfectly formed and incredibly fluid to use, making this amazingly versatile pen perfect for adding small detail or colour washing larger areas. Each pen has its own reservoir complete with a non-drip valve, so you don't need to worry about it leaking in storage.