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.
Biodegradable is the main reason u shd buy these kind of product. It does its job. Using to collect the dusts. Very transparent and light. Totally 3 small boxes each worth Rs. 65 Contains 30 bags. Size 43 cm×48 cm.