These ergonomically designed pens feature a sleek black non-slip surface over the entire shaft. Easy-to-grip, the Bionic Bl@ck pens are ideal for professionals and frequent users as the unique design allows for relaxed fatigue-free writing. This set feature high quality 0.5mm fine nickel silver rollerball tips and bionic liquid ink technology for smooth writing. Details:Available in multiple colors0.5mm tipErgonomically designedEasy-to-gripBionic liquid ink technology