Derwent Color Pencils STUDIO Set, 72 colorsThese pencils have a slim hexagonal barrel, 6.9mm in diameter, with a narrow colour strip allowing extra control for fine detailed work. The range is available in 72 colours which are all highly pigmented for maximum colour purity. If you prefer to work with a pencil which gives you more freedom of expression try our Artists range which has the same strip content as the Studio pencil so they can be used together to great effect.