Based on the Magnus ClickShift™ V1, Tactile Turn's version is rebuilt from the ground up to simplify production, tighten up the action, and improve the overall feel. The three-piece mechanism is machined grade 5 titanium and a C63000 bronze actuator switch to provide a smooth action while maintaining durability. It's the same diameter as Tactile Turn's other slim pens and same refill compatibility as their short length. Enjoy!