Welcome to Darkmetal-Design! We are designers and manufacturers of high-quality precision-made tactical tools, and recoil reduction systems. This listing is for our gel ink refills for all of our tactical pens. You are buying a pack of two(2) refills. Please specify color choices at checkout (Red, Black, Blue). (If you don't specify we will ship blue or black at our discretion.) Volume discounts are available. Please specify color(s) at checkout. These refills work on all of our pens. We make several styles of tactical pens the "DEFENDER", "PROTECTOR" and "DEFENDER ultra" or air weight. See our other listings for Tactical pens. If we don't have one listed that you are interested in more than likely we have one available, please send me a message on eBay and I will get back to you.