Paraben Free and Dermatologically Tested. Eyebrows are so important – they frame the eye and complete a well groomed look. Brow Line is a retractable eyebrow pencil that is so easy to use. The narrow nib is perfect for creating high definition eyebrows with a natural, hair-like look. The pencil itself is quite firm, making Brow Line very forgiving. With a built-in brush at the other end, the perfect eyebrow really is achievable.