The Winsor & Newton Cotman (series 111) size 24 round brush, is a watercolour brush specifically designed to provide balance & comfort when painting. The re-developed blend of special synthetic fibres gives the brush greater ability to make larger washes or longer lines, without the need to recharge the brush with colour. The colour carrying capacity of the brush has been increased by up to 50%. The most popular round watercolour brush. The Winsor & Newton Cotman (series 111) size 24 round brush is excellent for washes as well as fine lines.