Pentel EnerGel BL77 liquid ink rollerball pen features a rubberized grip for smooth writing and quick-drying ink. The top and push button are in ink color. It is refillable. Line width: 0.35 mm. Color: black. The Pentel EnerGel Xm Retractable rollerball is the latest EnerGel pen, boasting a stylish metal-look barrel. It has a rubber grip area with a grooved fingerprint pattern and a metal pocket clip. Pentel claims their hybrid liquid gel ink is smoother flowing and quicker drying than ordinary gel ink. The 0.7mm tip writes a 0.35mm line. Refillable with LR7 refill. This Pentel RECYCOLOGY Pen contains at least 50% recycled materials by weight. The next generation of Liquid-Gel-Roller in modern design with super-soft writing, fast drying gel ink, push-button mechanism and comfort grip zone for better grip. Refill: LR7.