About Diplomat Aero Fountain Pen - Black The Diplomat Aero fountain pen has an appearance of its own that was influenced by the Zeppelin's of the early 1900's. The unusual, but graceful shape of the Aero is characterised by grooves running down the length of the cap and barrel and a slow taper at either end. Manufactured from quality components featuring an all metal casing with a black lacquer coating and black plated fittings, the Aero fountain pen echoes the solid German quality that Diplomat have perfected since making their first pen in 1922. The Diplomat Aero fountain pen comes with a choice of 14ct bi-colour gold or polished stainless steel nib in sizes Extra Fine, Fine, Medium or Broad, has an ink converter included and is presented in an aluminium and card gift box.