Cosmotop spin holds more water than any other synthetic, a blend of 5 different diameters of extra smooth fiber ensures the highest color-absorption of any synthetic brush. Thicker fibers placed on the outside work with thinner fibers in the middle to trap and hold water and color. These varying diameters create a fine edge, stable shape, and energetic spring. Da vinci"s best selling watercolor brush available from 20mm up to 300mm wide. Also great for gouache and liquid acrylics