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.
Size (about 50cms) should be twice what was sent, and material should be thicker. With the current size, 10 come get wasted for tying up...and not much space left for garbage. Also, it tears off easily. Looks like recycled plastic.