The colour core of a Bruynzeel Expression water colour pencil measures 2.9 mm in diameter and is made from high-quality pigments for an extra effective colour transfer and complete solubility in water. The Bruynzeel Expression series Water Colour pencils are available in 3 tins. A basic set with the 12 most popular colours. In addition, this range comprises more comprehensive sets of 24 and 36 colours in order to add more nuance to your drawings. Each set contains a brush.