Itoya Xenon pens are large-barrelled, retractable, 1.0 mm (medium) ballpoint pens. Each pen is a smooth, ergonomic writing instrument with a comfortable rubber grip and chrome-colored accents. Comes with acid-free black ink. Refillable with almost all standard-sized ballpoint pen refills. This is a set of 7 colors of Xenon pens in Ocean Blue, Thundercloud Gray, Lava Red, Emerald Green, Amber Orange, Amethyst Purple, and Turquoise Blue. Write with every color of the rainbow!