The Cosmotop Spin synthetic brushes is a very popular brush at Wet Paint and daVinci's best selling line of watercolor brushes. It holds a lot of water in comparison with any other synthetic brush. Its unique, exclusive construction was developed by daVinci in 1983. It is a blend of 5 different diameters of extra smooth fiber to ensure high color-absorption with thicker fibers placed on the outside working with thinner fibers in the middle to trap and hold water and color. These varying diameters create a fine point, stable shape, and energetic spring. Set in ergonomic handles for maximum painting control. Large sizes are great for area work and seamless, nickel-plated brass ferrules that are rust-resistant and long lasting. Easy to clean.