Mine is usually a Caran D'ache (in fluorescent orange) to replace the one I just lost. They write great and the cartridge easily lasts ~2 years with my writing habits. The barrel is an aluminum extrusion and the pen has good heft. Most think it is an el cheapo plastic pen so you get a funny look when they use it. "Oh, wasn't expecting that." most common. I get them in orange so I can find it more easily as I am always putting it down somewhere and moving on.