The Pentel Aquash Water Brush Fine is the ideal tool for the watercolour artist on the go! Simply fill the reservoir inside the brush with water, or diluted watercolour paint, and you can paint anywhere. The brush features a nylon tip and is hard-wearing and easy to use. These handy brushes are ideal for artists who use mediums that react well with water, such as water-based marker pens and watercolour pencils. Pentel Aquash Water Brushes hold 10ml of water.