Eighth grade math. It was a team taught class, so I spent the day in support mode. But it's also how I learned about the new toy they had in class.
It's to help with fidgety middle schoolers. Imagine bouncing your feet on these. (I kind of want one.)
The teachers received a grant to outfit the classroom with them.
I don't know if the kiddos like them or not. The other teacher kept them busy all period, so I had no chance to ask.
However, one student pulled it back and released it, creating a low note vibrating through the air.
Ms. V: "If you're going to deliberately make noise with that, I can move you to a desk that does not have one."
After that, all vibrating bands were clearly accidental. I guess they didn't want to be moved.