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.
Extremely badquality piping bag. Although the product wins on the reusable piping bag line and honestly I bought it for that only. But sadly it burst in the first use only that left me with no other option. Hence, it's always advisable to purchase use and throw piping bags so that if one bursts, you have others to back you up.