To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
The roll I received was very poor quality because the plastic broke open with the slightest bending. Even just straightening the coil caused it to split open. Similar tubing I bought at a local pond-supply outlet (albeit at a higher cost) was much better quality.