The Aqua Brush Duo is a water-based double brush tip pen, suitable for artists, designers and amateur painters of all ages. The two tips are very durable and will produce the same high quality results for a long time. The tip at one end allows you to use a technique similar to painting. The other tip can be used to draw thin, precise lines to create perfect drawings. The water-based inks can be mixed together. They can also be used like water-colours.