Replacement Tips for MARBEL markers. This pack contains 3 rectangular 15 mm wide tips ideal for large creative projects, fast and even coverage of large areas, whether it's wall art, posters or bold designs. The tips are very easy to replace—simply pull the tip out of the marker and either clean it or insert a new one. You can rinse the tip with clean water, let it dry, and place it back. If the marker doesn’t re-prime properly after cleaning, it means the tip is damaged and needs to be replaced.