One of the most popular tools of professional makeup artists, the Filbert brush (or Cat's Tongue), is shaped to mimic the pad of the fingertip. Used correctly, a Filbert creates a solid line with soft edges. (FYI: Flat brushes do the opposite.) Cinema Secrets Filbert Kolinsky Brushes are made from pure Kolinsky sable. Each is manufactured to our exact specifications, tested by makeup professionals, and individually inspected to meet our strict guidelines.