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 goes into the creation of each and every brush Fine brush-making is a true art Acrylic handle, acetone-resistant. This brush is round, which was crimped at the base of the brush, which makes a flatter belly while still maintaining a tapered point for precision and control. Always clean a good quality brush thoroughly after each processing session with brush cleaner or liquid monomer DO NOT USE ACETONE because Acetone will remove the shine from bristle make acrylic tacky and buildup residue. Remove as much moisture as possible with paper towel and reshape before storing.