Pre-owned Chenyu dual bearing fidget spinner in zirc. 

https://www.youtube.com/watch?v=geIRdKp1nXc

Innovative Dual-bearing Design

The outer thick body uses a R188 bearing, the inner cog uses a 6703 ring bearing. The two sections have a small amount of friction together, so if you spin one section alone, the other section will start moving too. When spun together in the same direction, they complement each other and add extra performance and feedback.

As a result, the whole structure of this spinner is far more sophisticated than normal fidget spinners. And it requires higher precision of each part compare to normal ones.