5 diameter construction perfected for washes in watercolor and fluid acrylic * Like series 5080 ultimate wash but utilizes a slightly and stiffer longer fiber to give it extra strength and stiffness while still retaining a smooth, strokeless finish * An outstanding top of the line brush for oil, acrylic, water-mixable oils, priming and of course, varnish * Great for large area work in all watercolor, oil and acrylic Leaves no brush marks * Certified green manufacturing with sustainable wood handles; handmade in germany at our family owned factory since 1890