These gel highlighters feature Sharpie's strongest smear-resistant formula, meaning that they do not smear the pen inks, marker inks, or even ink jet printouts that you highlight over! Highlight, write, doodle, draw, and more with these bright colors. Due to their unique gel composition, these highlighters do not bleed through papers, including the glossy or thin papers found in magazines or newspapers. They also resist drying out even if left uncapped, and the tip shape can be easily worn down to conform to your writing style. The gel stick is extended by twisting the back end of the highlighter.