Original design with a ballpoint pen and cap style body. Gel Ink Ballpoint Pen Refill 0.02 inch (0.5 mm), Black (02814434). Product Features: All main unit and refills are compatible with refills. Once the ink runs out, you can refill the refill. Even if the clip becomes broken or the cap is lost, you can only replace the main unit. For those who want to use this product as their own personal preference, the color and thickness of the ink, we recommend purchasing a combination of the product. You can choose the refills of each color and different thickness to get the one you like.