Sensa, the worlds most comfortable pen, features a world patented plasmium gel grip that conforms to the unique shape and placement of your fingers for ultimate comfort, for a writing experience which is out of this world. Facets of creativity. Sensa Mosaic tickles the imagination with its unique design. It renders a playful perspective, enabling playful expression. Comes with a Parker gel ink cartridge. (You may also purchase an additional Fisher Item #SPR4 pressurized ballpoint refill to fit this pen.)