Diplomat Aero Blue 0.7MM Mechanical PencilThe Diplomat Aero Blue mechanical pencil pen features a Zeppelin inspired anodized aluminum body with groove like depressions on the barrel and cap. Made from full aluminum casting that is anodized and matte chrome fittings. The body has groove like depressions on both the cap and the barrel. It has a satisfying soft sliding click cap that posts securely onto the barrel when writing.