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These tiny tiny speakers look very similar to the Bose Soundlink Mini.
They are actually from the Sony SRS-X33 (Thanks to Isaac Coker for the information!).
They share a very similar UFO style neodymium motor.
These however have a stronger 2-part cone and greater excursion.
As you can hear, even at full throw, they barely have any mechanical noise.
I've only had them a few hours, but these are already my favourite little drivers!