Mighty Fine Waterproof Brow Pen, #4.5

As a precise, felt-tip brow pen from Benefit Cosmetics, the Mighty Fine Waterproof Brow Pen #4.5 delivers hair-like strokes with a fine, ink-like formula that sets quickly. Its waterproof finish suits oily skin and humid climates, while the slim pen shape targets sparse arches and precise detailing. Ideal for users seeking natural definition and long-lasting wear without heavy buildup.