To calculate the overall star rating and percentage breakdown by star, we do not 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 analyses reviews to verify trustworthiness.
My friend has a 6yr old nonverbal autistic daughter who LOVES stackable rings and goes through the Fisher Price rings FAST. These are holding up awesome!! The green silicone one is a lifesaver and I wish I could buy just those ones.