EnerGel RTX Retractable Liquid Gel Pen, .7mm, Black/Gray Barrel, Green Ink, Sold as 1 Each Refillable, retractable roller ball gel pen with pocket clip. Sleek and stylish barrel design with metal accents for a professional look. High-performance ink technology combines the best qualities of liquid and gel ink for a super-smooth writing experience. Liquid gel ink dries so fast even left handed writers love it. No smears, no smudges, no globs.