Retractable water-based color pen that wont dry out even without a cap; Product Description: Uses moisture keep ink that absorbs moisture from the air, so it wont dry out even without a cap. A colorful lineup of colors that will make your journal and notebook. [Details] Writing line width: 0.02 inch (0.6 mm), retractable type, water-based *Ink color is an image. Actual ink color refer to the color of the nib.