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.
I used this zipper as an inexpensive replacement for #10 zippers that I've previously used for making vinyl seat cushions. My biggest complaint is that the zipper pull has to be on the same side as the raised part of the zipper. I didn't think this would present a problem until I sewed the zipper in place. Hard to describe the problem I encountered but sewing the zipper with the side with the raised surface facing down creates a problem not only with maintaining a consistent stitch but the edges of finished item do not fully close over the zipper. VERY difficult to explain. Bottom line is that I won't use this type of zipper again.