Ballpoint pen made from recycled PET plastic, reducing the use of virgin plastic. The ink in a gel pen is a combination of water-based and oil-based components, which gives it a smooth and consistent flow that is comparable to a fountain pen. This type of ink is also known for its resistance to fading, making it a popular choice for artists and writers alike. Gel pens typically have a fine, ballpoint tip that allows for precise and controlled writing.