Zebra Clickart Markers Set of 12 - PastelZebra Clickart Markers New Clicker Technology. Uses a new ink that absorbs moisture from the air These pens are designed without a cap. While retracted, the tip is exposed in the air, but it contains a special ink to attract moisture from the surrounding air. The tip of the marker can stay hydrated for at least 52 weeks under 68 Fahrenheit and 60% moisture level. The pen is slim, convenient, and comes with many vibrant color options. Total of 12