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I have used this product on multiple rings. It is easy to use and the rings remain comfortable to wear. The pack comes with 2 sizes so suitable to coil around thin rings and somewhat wider rings. This is a very useful product for rings that are a little too big for your chosen finger. It would not be suitable where the ring is several sizes too big for you or has a very wide band. A good and inexpensive find!
The product does as it describes, it could be slightly cheaper as you only need one of the plastic coils but it's a clever way of fitting a ring that's too large and it's not really that visible to outside either. My personal ring was probably probably 0.5/1.0 too big as personally measured it but now after putting the plastic coil on it fits perfectly and isn't loose at all.
I’ve tried other products (stickers) and bought this (with some skepticism) because the other products didn’t work. But this works great, easy to attach to the ring, doesn’t get affected when wash hands. You only need a little bit per ring so the packet will last a very long time (and for many rings). It is visible at the back, but looks more discrete than I expected. Very pleased with it!