This is a carbon cube for sale. There are no issues with rotation. While it's not for competition and doesn't have magnetic assistance, I think it's relatively easy to turn. I haven't used silicone or lube. Even though it's not for competition, I think it can become even easier to turn with maintenance. ※This might sound a bit cynical, but it's not like a game's challenge run, but it might be interesting to see how far you can go with this cube. Of course, it's common sense to use the best cube in competitions. If you'd like me to add more photos, please feel free to comment. Thank you very much!