38 110 Copper - Pilot G2 (Rollerball)
Copper is unlike any other material out there. This material is C110 Copper (99.99%) and it is difficult and picky to work with. The machined finishes glow. The weight and feel is super satisfying. Even weight distribution with excellent finish on the tube with slight texture from the machining lines. Has a hefty feel and is great to write with. Clean machined finishes right off of the machine.
Twist mechanism with triple start screw thread is super simple and reliable. Carbide drill makes the hole in the tip at very precise tolerance of 25 micron. Comes with a very smooth writing rollerball style Pilot G2. I pay very close attention to the tolerances and surface finishes. 5-1/2" (140mm) long and 0.36" (9.1mm) in diameter. 42g (1.48oz) in weight.