Clipless fountain pens aren't rare, but they can be controversial. The Vertex fountain pen wasn't our first try at a clipless fountain pen, in fact, it wasn't our second or third. But it's the only one that's stuck around and become a fan favorite. The design of the Vertex is based around the idea of a near-seamless transition from the grip to the body with an elongated grip made of acrylic or polycarbonate giving the impression of an "ink window". Secondarily, our implementation of o-rings in our pens allowed us to create a pen that caps with a custom o-ring, seals the nib with an o-ring, and seals the body with a third o-ring. Providing the possibility of eyedroppering the pen without the need for silicone grease. The shape is a modern cigar-style that draws inspiration from classic fountain pens from Wahl-Eversharp, Parker, and Sheaffer, but does so in a way that feels fresh and new. Though we designed the Vertex with resins and plastics in mind, we've since expanded to include aluminum, and most recently, fully-machined brass versions. Our most comfortable fountain pen by a large margin, the Vertex has quickly shot up the ranks in popularity, edging out the INK for our top fountain pen spot.