Derwent Watercolour pencils have all the beauty of watercolour paints but all the control of a pencil. An hexagonal, 6.9 mm diameter pencil with a blendable smooth water-soluble 3.4 mm colour strip. Highly pigmented for maximum colour purity. These versatile pencils provide maximum control and allow a wide variety of watercolour painting effects to be created. They can be used both wet and dry, the ultimate in flexibility.