Magnetic Spinner - E-Blox®

My son figured out how to snap this onto his circuit build and suddenly the whole thing spins. It clicks in magnetically, which makes it way easier for small hands than the pieces that need to be forced together. Nice little add-on if your kid already has a building set.

I grabbed this to add some motion to our existing circuit builds and it snaps in way more securely than I expected. Watching the spinner actually spin off the circuit current never gets old.

My kid spent almost an hour figuring out how to balance the spinner on top of his circuit build, and when it finally spun he wouldn't stop grinning. It's a single piece so there's nothing to assemble, which is nice when you just want to add motion without digging through a bin of parts.