To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzes reviews to verify trustworthiness.
They are great quality, got them as a gift for my 2 m.o. niece. The rattle is a single bead inside, the noise isn't very loud, which may even be better for the baby. Overall, I was happy with the purchase, and so were my BIL and SIL. Not sure if they have tried them out on my niece yet.