The body and refills (refills) can be used as a "choice" gel ink ballpoint pen, Hi-Tec-C Coleto 0.4 mm refill 4 color barrel for 3 types (0.3mm, 0.4mm, 0.5mm) writing widths, up to 57750 refills from 15 colors. You can choose the combination. To set or replace refills, simply open the lid on the head and insert the refill. Its that simple...