Roubloff squirrel brush, round, №4 Brush series: 1410 Produced by: Roubloff, Russia Roubloff squirrel brush, round (series 1410) is made from pure squirrel hair. These are round brushes with fine tip. Sizes vary from №0 till №12. Roubloff squirrel brushes are widely used by watercolorists, but you can also use them for other painting techiques. Roubloff brushes are made in Russia since 1998 and are among of the best brushes on the Russian market.