PILOT FriXion Ballpoint Pen 3 Slim 0.5mm Design Series 1 This 3-color ballpoint pen has an ultra-thin body with a maximum diameter of 12.8 mm, which is 1 mm thinner than conventional ballpoint pens, which inevitably have thicker shafts to accommodate multiple refills. The tip has no bumps so that it can easily fit in a bag, a suitcase, or a pen holder in a notebook, improving portability. The ball diameter is an ultra-fine 0.5mm type suitable for general writing, and there are three ink colors: black, red, and blue. After the handwriting has dried, erase it with the special rubber. Refill part number LFBTRF30EF-3B/3R/3L (black, red, blue)