Sarasa retractable gel ink pens from Zebra. Sarasa pens use water-based pigment gel ink which is acid-free and archival quality. The ink is smooth and free-flowing. The see-through barrel allows you to see the ink supply so you know when you're running low. The barrel has a soft rubber grip for comfortable writing. The pen color matches the ink color. These pens have a medium point (.7 mm) and are available in nine (9) colors (from top to bottom in the photo): Mahogany, Cobalt, Lime Green, Navy Blue, Fusica, Forest, Red, Orange (not pictured), blue (medium -- darker than cobalt & lighter than navy) (not pictured) and black (not pictured.