Gel Xtreme Pens by Yasutomo. Make your projects and correspondence really stand out with the sparkling colors offered by these metallic gel ink pens. The water-based metallic inks produce dramatic effects on dark and light papers, making these pens a great tool for embellishing and decorating letters, cards, notes and journals. For an extra magical effect, add embossing powder to the ink. The black ink pen offers a finer point than the colored ink varieties.