"These are cute, but some arrived broken right out of the sealed box. In some cases, I mean literally broken, meaning the jaw was broken away from the top of the mouth. In other cases, winding the toy just did not make it chop chop the teeth. I would say 1 out of 5 worked very well, 3 out of 5 worked fairly okay, and 1 out of 5 did not work at all. So 4 out of 5 worked in one way or another. Not at all bad for the price, but just don't cut the count too close. They are inexpensive so buy an extra box rather than risking running out of working ones."