Ergonomically designed with a non-slip surface over the entire shaft, this easy-to-grip pen features a high quality nickel-silver rollerball tip for extremely smooth writing. Bionic Worker utilizes the latest bionic liquid ink technology, and is available in .5mm point size. The fun orange shaft color offers a stand-out alternative to the uniform gray, black and blue pens. Ideal for professionals and frequent users, the unique design allows for relaxed fatigue-free writing. Details:Includes black, blue, green and red0.5mm point size5 sets (4 pens per set, 20 total pens)