i can identify yoyos would you mind taking a picture of it
I don't post personal photos on the internet so I'll describe it
transparent blue and green, one of the sides has the torque equals impulse times rotational acceleration and force equals mass times acceleration equations on it and the physics class I'm in
it screws apart into halves and in between there's a smooth circular washer-type thingy that embeds into and slides smoothly along either half
the string is a white weaved string made of two strands that separate and wrap around the washer
hope that's sufficient enough