The No. 1 brush of the Urban Sketching movement, The Da Vinci Casaneo features Da Vinci's innovative "wavy fiber” that returns to a point or edge far better than any synthetic squirrel brush. Excellent for watercolors, gouache, acrylics, inks, and for calligraphy and silk painting. - Da Vinci Casaneo Synthetic Squirrel Watercolor Brush - Quill Round Wash, Size 6, Short Handle, SyntheticCasaneo Quill Round Wash sh, SZ 6 -