The Rimmel Oh My Plump Contour Lip Pencil is a precision lip liner designed to define and enhance the shape of the lips with intense, long-lasting color. This 1.2 g lip liner features a highly pigmented formula that provides full coverage without smudging, transferring, or fading during wear. It creates clean, sharp lip lines that prevent lipstick from bleeding beyond the natural lip borders while extending the wear of lip color products applied on top. The pencil formulation helps achieve well-defined lip contours and contributes to a fuller lip appearance by emphasizing the natural lip structure. Suitable for creating precise lip outlines before applying lipstick or lip gloss, it can also be used to fill in the lips completely for a defined look. The product focuses on durability with its long-lasting properties and reliable performance in maintaining clear lip definitions. The practical application involves first marking the lip outlines with the pencil, followed by applying lip color for enhanced shape and color retention.