The basics My Line and Fill™ has an expertly curved brush head made from synthetic fibers.  The benefits The Shape of the brush tip hugs the natural curve of the lips, allowing for a defined lip line while also filling in the lips with ease. The uses For defined lips without lip liner, first fill in your lips using My Line and Fill™ and your favorite lipstick. Then using the curved side of the brush, trace the outer line of your lips concentrating on the cupids bow to give more fullness. The bottom line Voted SHEERLUXE Favourite for Best Application brand of 2023. Hair: Synthetic. Length: 17cm/7"