Liner brushes range from 10mm to 20mm sometimes.  Length and control are important to the artist.  This 12mm liner is the perfect in-between for nail artists who are looking for the perfect control liner brush that is not too long or too short for situational needs.  Perfect for French, swirl designs, and the most common trendy nail design.  This 12mm will be comfortable and perfect for precise line work with the perfect length and thickness.