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.
I received only one mask for Rs 215/-. The quality of the product was poorest. It will not be reusable even after first wash. Matrial used in the product was very cheap. I think cost of the product will not be more than Rs 30/-.
Maskquality is very poor, and not as per its price. Size is small due to which it do not face and valve do not contain any filter. Only one very thin cloth behind net in front of mask. Not worth buying.