BIOLUMINESCENCE NEON GEL PEN SETSome organisms naturally create light so they glow in the dark. The ocean is home to many bioluminescent creatures, from algae to deep water octopuses, but you'll also find glowing insects (like fireflies), mushrooms, and bacteria! Write in the colors of the word of bioluminescence with this neon gel pen 6 pack. . 7 mm tips Neon Gel Ink Each pack contains 6 unique colors: Stauroteuthis Deep Water Octopus Messmate Pipefish Firefly Agaric Mushroom Algae