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.
Not all the nozzles they show in the picture came. I got few repeats and not even one closed star nozzle. For 150 rs I'm not complaining too much but I wouldn't recommend paying any more than that. The bag was fine. Use gentle pressure while using. Update- bag burst because I used stiff icing. The last time I used thinner consistency.