The Cap-O-Matic style pen utilizes cap activation to extend and retract the point. The M4B/S carries the same gas pressurized refill as nearly all other Fisher Space Pen models, which means that they possess 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. Our pens are proudly Made in the USA and unconditionally guaranteed with recyclable parts and packaging - staying GREEN! Please note that the stylus portion of this pen can be replaced with ease by simply unscrewing it from the body. This replacement part is considered a disposable item and is NOT covered under our repair or replacement policy.