TETZBO Chibien This pen is composed of three parts: a brass body, a refill, and a screw. The refill is secured with the screw using a hex wrench. The refill uses a Mitsubishi Jetstream refill (SXR-80). Due to the properties of brass, the color will change over time and with use. I think you'll enjoy watching it develop a patina. Polishing with metal polish, such as Picc, will restore it to a like-new condition. Please consider this item with the understanding that it has been previously owned. Thank you for your consideration.