A Different Kind of Fidget Toy

Uploading a video of a rather quite neat little doodad I came across by chance. I don't think getting a sharp one will be easy, but if you're just after something to fuss with, you could check out:
https://www.amazon.com/s/?url=search-alias%3Daps&field-keywords=butterfly%20knife%20trainer
Not sure about the quality of those things, though.

Видео A Different Kind of Fidget Toy канала 1stSpyGuy