da Vinci Watercolor Series 4018 CosmoTop Spin Paint Brush Set, Synthetic with Bamboo Brush Mat, Multiple Sizes, 4 Brushes (Series 5580, 5584, 5880) Cosmo top spin 5 diameter synthetics are our best selling watercolor brush and hold more water than any other synthetic brushes Thicker fibers placed on the outside work with thinner fibers in the middle to trap and hold water and color Certified green manufacturing with sustainable wood handles Nickel plated brass ferrules are the best money can buy Brush will retain its shape Handmade in germany at our family owned factory since 1890