Rotring Extension Trio Pen. The grip is clearly different from the current Trio Pen. It has a metal body, giving it a good weight, a low center of gravity, and a grip shape that fits well in the hand. Weight: 34g (For reference, the current Trio Pen is 28g) Overall, it's clean, but there's some shine that's noticeable upon close inspection. It's a 3-in-1 pen with black, red, and a mechanical pencil. It uses Rotring's original refills. The ink flows. It's a D1 standard, so it's also compatible with Jetstream and Acro ink refills. Type: Multi-function pen Ink: Oil-based Body material: Metal #Rotring #rotring #TrioPen #MultiFunctionPen #PendulumType