The product is a black permanent marker. It is designed to write on CDs, DVDs, and other optical media. The marker has a fine point tip that allows for precise writing. The ink is quick-drying and smudge-proof. The marker is also refillable. This permanent marker is perfect for labeling your CDs, DVDs, and other optical media. The fine point tip allows for precise writing, and the quick-drying ink ensures that your labels will not smudge. The marker is also refillable, so you can use it over and over again.