Una pencil designed to shape, define, or fill in the lips. Una pencil designed to shape, define, or fill in the lips. Lip pencils have a una creamy and even texture, perfect for enhancing the lips or filling them with color. They last long and are available in a wide selection of colors, each of which blends perfectly with many shades of lipstick. Lip pencils also contain vitamin E, which acts as an antioxidant. Lip pencils can be worn alone, with lipstick, or lipglass.