This is the original "Bacterio" pen, which was produced as part of Collezione Materiali. That pen collection is intended for each pen to have unique designs and manufacturing processes. That is absolutely the case with "Bacterio". It used a unique shape and featured an all chrome design, with laser etchings filled with blue colored lacquer. While we have a collection of etched pens now (which also uses "Bacterio" on a standard bullet shape), this "Bacterio" pen was the first we produced to use that technique. Comes packaged in a wooden ACME box equipped with a black roller ball refill, and designer bio card.