These are gel ink refills forPilot Hi-Tec-C Coletopen system.
Hi-Tec-C Coletooffers unique way of customizing the way you write. Customizevariousink colors with compact beautiful pen bodies. You can choose abody you love and fill it with any combination of gel pen. pencil. and other components that you like.
The smooth ink. precise needle tip and high level of customization make Hi-Tec-C loved by many students. artists and designers.