Fave pen. Retractable Type of lead: 770 lead. Lead: M, blue, indelible and interchangeable. Pen type: plastic. Clip: Plastic Ballpoint pen in fresh, transparent colors. Office 765 and Express 775 replacement leads. Schneider ballpoint pen and leads with the Plug + Play symbol are compatible with each other. This makes changing mine very easy. Body color: assorted.