Pilot G-Tec-C4 Gel Rolling Ball Pens allow for ultra-fine writing with the 0.4mm tip. The innovative, bio-polymer ink formula prevents feathering and provides the smoothest writing without smearing every time. Each pen has a design that includes a plastic clip, plastic cap and metal nose cone. Though they are not refillable, Pilot G-Tec-C Gel Rolling Ball Pens are still designed for razor sharp precision with a textured grip for precise control. You can take detail and artistry to another level.