But the size difference is more like 7. 5 to 9

All different sizes in the package. I could understand if there was a half size deviation between the five rings in the package since the description of the product I purchased said 7.5 to 8. But the size difference is more like 7.5 to 9.5. As a result only two out of the five rings is the proper size. see picture. The rings with a color stripe in the middle are larger. The solid black and solid gray are true sized. From picture of my fingers you can see the rings get progressively bigger.

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