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The websites description of the Brow Wiz says-
"Ideal for filling in sparse brows with the ultimate natural look, Anastasia’s ultra-fine pencil tip mimics the appearance of tiny hairs. The dual-ended mechanical pencil and essential Spooley Brush make creating a fuller brow look not only easy, but convenient too. The mechanical lead saves product and never needs sharpening, and the built-in spooley brush on the opposite end brushes and blends in Brow Wiz to natural brows seamlessly".