Acrylic Nail Brush "Super Kolinsky Brush #20" Last Long and High Quality by Kolinsky. $23.99. 100% kolinsky. Kolinsky nail brush. Nail Brush. Brushes made of Kolinsky hair are widely known to be the finest available, offering spectacular artificial nail-fashioning results. A "Kolinsky" is a Siberian member of the weasel family with tail hairs which are perfect for brushes for professional nail-sculpting. Only the finest materials, master crafted by experts A great amount of work ...