To calculate the overall star rating and percentage distribution by star, we do not use a simple average. Instead, our system takes into account, for example, the current rating and whether the reviewer purchased the item on Amazon. It also analyzed the reviews to verify reliability. O frete grátis está sujeito ao peso, preço e distância do envio. Customer reviews, including reviews of product stars, help customers learn more about the product and decide if it`s the right product for them.