Box of 12 Zebra Sarasa Dry X20 0.7mm Black Gel Ink Retractable Rollerball Pen, 46810. Sarasa Gel Retractable Pens contain a smooth-flowing, fast drying, water-based, pigment gel ink. Soft rubber grip provides writing comfort and control. Smooth gel ink delivers scratch-free writing. Translucent barrel provides visible ink color and supply. Ink is acid-free and archival quality. Refillable with Zebra Sarasa X20 refill Z2A87012.