1. A Reuleaux triangle (or other Reuleaux polygon) would also work.
2. It actually has 3 bends.
5. Not "microspheres", just a pressure-sensitive adhesive.
Its small enough that the kid could probably swallow it. Plus it being oblong that way they could probably still breathe due to it not blocking the entire windpipe
Did I stutter? Links or it didn't happen. If your going to say something, you better be ready to back it up. We are getting tired of this crap. Some have even been banned for it already.
2. It actually has 3 bends.
5. Not "microspheres", just a pressure-sensitive adhesive.