5 diameter construction perfected for acrylics and washes in watercolor, gouache, tempera or fluid acrylic * Thicker fibers placed on the outside work with thinner fibers in the middle to trap and hold color and distribute evenly * These varying diameters create a sharp point, stable shape, and energetic spring * Certified green manufacturing with sustainable wood handles; Nickel Plated Brass Ferrules are the best money can buy; Brush will retain its shape * Certified green manufacturing with sustainable wood handles. handmade in germany at our family owned factory since 1890