• SEALED PRESSURIZED INK REFILL • Refill tip is Ultra-hard Tungsten Carbide Ball, Stainless steel precision socket prevents leaking yet delivers uniform ink flow. • Writes underwater, upside down, at any angle,extreme temperatures from – 30º F (-35º C) to +250º F (121º C), over grease, 3 times longer than the average pen, etc. • Compartible with all standard Fisher cartridges. • Come with branded Clip. • Cap slides over the barrel to activate mechanism. • Shiny Black Cap-O-Matic Ballpoint Pen. • The Cap-O-Matic line utilizes cap activation to extend and retract the point. • They carry the same gas pressurized refills as nearly all of our other pens, which means that they have all of the unique capabilities that you would expect from a Fisher pen: they will write upside down - at any angle, under water, through grease, extreme temperatures ,-30 to +250 degrees F, on almost any surface, three times longer than the average pen, and of course in the gravity free vacuum of space. • These pens are proudly Made in the USA and unconditionally guaranteed with recyclable parts and packaging, staying GREEN.