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.