Colouring your artwork or painting on location is easy, anywhere and anytime, with the Koi® Colouring Brush pens and the handy Koi® Watercolour Sketch Boxes and water brushes. Koi is ideal for producing colourful illustrations, hand-lettering and watercolours. The Koi Colouring Brush Pens with a flexible brush tip are perfect for easy colouring and writing in a variety of vibrant colours. A diverse range of Koi Watercolour Sketch Boxes offer handy watercolour sets for painting in a studio or on the go. With the refillable water brushes, the most beautiful colour transitions can be created and will give your artwork an artistic watercolour effect.