Four cheers for the Hi-Tec-C Coleto! The newest Coleto line can now hold FOUR Hi-Tec-C Coleto catridges! This device takes the all-time favorite, the Pilot Hi-Tec-C, and makes it into a multi pen! Now you can pop in any four color cartridges of your choice and customize your pen with any ink color you desire. New line also features beautiful colored bodies. Cartridges come in 0.3mm, 0.4mm and 0.5 mm sizes.