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 and .3mm point sizes. 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. Both sets contain one each of black, blue, green and red.