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.
Not good quality...many of them are scratched and the metal bar that attaches to the piece you squeeze looks like its barely attached on many of them. Wish I had gone thru them all before starting to use them. I have thrown many away. Will not purchase these again. Save your money.
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