With the Hi-Tec-C Coleto multi pen system, users can choose any pen body and fill it with any combination of gel pen, pencil, and other components. It is easy to add and replace refills with this pen body. Its easy-open flip-top cap boasts a textured conical design which is easy to open one-handed. Users can simply drop a refill into any of the pen's body component slots with the top cap open. Users can also tell when the ink is finishing as it has a translucent comfortable rubber grip which is also great for long writing and note-taking.