Series 11 has English shaping with a fuller belly than series 10 or 35 by da Vinci. The Maestro designation denotes the highest quality winter male kolinsky red Sable hair from the tobol River region in eastern Siberia. Excellent for Watercolors, illustration, animation and rendering. All brushes are handmade from raw material to finished brush by skilled artisans at the da Vinci factory. Seamless, gold plated brass ferrules are rust-resistant and long lasting. 4 brush set with round sizes 2/0, 0, 1 & 2.