Features: Black anodized aluminum. Texture for added grip and control. Orange PMMA plastic inlay. Compatible with Fisher Space Pen cartridges. Description: The Tenax Pen is a rugged writing tool from Audacious Concept that's overbuilt to go where you go. This pen is made from durable, lightweight metal that resists corrosion. For refills, get your favorite color of Fisher Space Pen cartridges. We carry knives, axes, and yes, even Pens! Find a writing tool to fit your lifestyle! Or maybe you want a pen that's a little more tank-like. We have plenty of Tactical Pens that fit the bill!