Do you mean the copper one? Its meant to powerline as set up now, but it really shades well too. I love it for any big groupings. it has balls but is really smooth and steady. Copper and brass are high density and absorb vibrations not that it makes much. I've used it with a short stroke set up and it airbrushed in grey shading but is on the porky side for quick hand movements@155grams, so switched it out to a 5mm stroke to bold line, and with the Kubin I'm very pleased with my liners. Seems like anything that can line well can do most other jobs well too. The Rapier is fixed at 4.2 and has a bit of give but I can't quite mesh with it so I traded it. I've got a few machines yet to buy or awaiting delivery soon. I've also a couple of my own prototypes in the works too...