Kolinsky synthetic hair, black/red handle pointed round brush use for oil and acrylic. Kolinsky sable-hair brush is a fine artistsXDT paintbrush. The hair is obtained from the tail of the kolinsky use for oil and acrylic. It is generally conceded to be the best material for oil and watercolor brushes due to its strength, spring and ability to retain its shape ("snap"). It holds a very fine point or edge.