The use of the material is no gimmick. Just like a roadster is modeled on the lines of a coupe, but made to be faster, lighter, and better, the CARBONARA pencil is designed to be stronger, lighter, and better than a regular mechanical pencil. The carbon fiber gives it its light weight, but also plays a crucial role in the functioning of the pencil. The pencil comes with two hollow slots running across the side, separated by a pillar in the middle. Press down on one slot, and the other one expands ever so slightly… More at YD.
I kind of like the design, but there is a reason the humble wooden pencil remains king. It works.