Introducing the 50 Caliber Flip Pen - a unique addition to your collection of writing instruments. This one-of-a-kind pen uses a spent 50 caliber shell as its base, giving it an authentic and rugged look that is sure to turn heads. When the pen is inserted into the shell, it looks exactly like a live round, making it a great conversation starter. The rubber gasket locks the pen into the shell securely, but it can be easily pulled out and used as a writing instrument. Whether you're a pen enthusiast or just appreciate quality craftsmanship, the 50 Caliber Flip Pen is a must-have for any collection.