Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
These are great! A bit smaller than I thought they would be but I'm able to work with them. Using for our daughter's graduation from college. Vendor was great when we requested just certain colors and received within a week. I liked them so much that I ordered more.