Uni-ball ZENTO Signature Model 0.5mm Black This is a short-sized water-based ballpoint pen, similar to the popular Uni-ball One P. It's the highest-grade model of the three available, featuring an incredibly smooth-writing ink and a short body. It has a magnetic cap like the Kurutoga Dive, and the satisfying click sound and feel of attaching and detaching the cap is addictive. Bulk purchases are also welcome, so please feel free to inquire!