The CRKT Techliner Pen is a pen that stands out. It's simple and not cumbersome, yet distinctive in its own right. Constructed of 6061 aircraft-grade aluminum, it is built to last. Its Fisher Space Pen® black ink cartridge is replaceable and refillable (Refill #PR4). A fantastic and unique feature of the Techliner is its magnetic ends, which serve to secure the cap or attach the pen to different surfaces, making it ideal for all kinds of work environments. You're sure to notice this tool is not just "okay" or even "good", but great.