Da vinci"s highest grade kolinsky red sable hair from the tobol river regions in eastern siberia. Expertly shaped, they are unmatched for spring, resiliency, color-carrying capacity and ability to hold a sharp point. Excellent for precise, controlled brush strokes and detail work. The best oil sable brushes on the market today. Made in Germany. Series 11 has a slightly fatter belly than series 10. Available in size s 10/0 to 24.