Da Vinci Cosmotop-mix B Series 438 watercolor brushes are a combination of Kolinsky Red Sable, Blue Russian Squirrel and Fitch (Black Sable) along with a small amount of synthetic hair. They meet the highest standards in the production of brushes. They have precisely shaped tips with high flexibility as well as an excellent water holding capacity. They have a short, varnished handle. The total length of the brush 19-26cm.