The ultra-high machining tolerances between the pen and sleeve create a piston-like effect. The pen falls slowly into its sleeve and makes a nice popping sound when you pull it out quickly. Pen Type-B has no visible logo. The brass sleeve purposely doesn't have a coating, so your Pen Type-B can develop its own unique patina over time as you handle your pen. Pen Type-B is available with an ultra durable matte black ceramic-polymer coating (Cerakote). Pen Type-B in titanium weighs almost half the weight of its brass and stainless steel counterpart. It's got the hardness of stainless steel and the lightness of aluminum. That's really hard to beat. Titanium is the ultimate material. Both the sleeve and the pen are made of titanium.