Anastasia Beverly Hills Brush 20 – Dual-Ended Flat Detail Brush is a flat, square-shaped eyebrow brush with firm synthetic fibers, ideal for defining eyebrows and blending highlighter or concealer for a smooth appearance. Use the spoolie end on this precision makeup brush to blend product for a soft, natural-looking finish. The ultra-thin, densely packed fibers on this eye makeup brush are ideal for blending Highlighting Duo Pencil or Pro Pencil on the brow bone for a softly defined finish.