The video starts with a close-up shot of a person's hands holding a pen. The person then proceeds to unscrew the cap of the pen, revealing the ink cartridge inside. The person then removes the ink cartridge from the pen and replaces it with a new one. The person then screws the cap back on the pen and tests it by writing on a piece of paper. The video ends with the person holding the pen and showing the ink cartridge to the camera.