Like other Sarasa Clip pens, these pens contain Zebra's Sarasa ink, which is a water-based pigment gel ink. Vivid in color and smooth-flowing, the ink delivers consistent, crisp lines. It is feather resistant, water resistant, and has high lightfastness. The retractable pen tip is sturdy enough to endure hard writing pressure and pen drops. The clip is not only cute but functional—it is a strong break-resistant binder push clip that securely fastens the pen to pockets and notebooks. The pen also has a rubber grip for comfortable writing.