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The Glossier Brow Flick Microfine Detailing Pen in black noir is a versatile and handy product, according to Lluvia's video review. This microfining pen allows for precise strokes to create fluffy and detailed brows with natural-looking color. It can also be used as an eyeliner, showcasing its versatility. Lluvia praises the product for its ability to create a natural wing and mentions that it comes in a variety of colors. Overall, the Brow Flick Microfine Pen by Glossier seems to be a great value for its price, offering multiple uses and delivering the desired results.