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I didn't want to resize my engagement ring as once the wedding band went with it, it would need to be sized back up again. The jeweller put the metal clip version of the resizer on for me. I used it for about a month but it wasn't staying still and was scratching the ring. I ordered these (not realising how many were in the packet) and it was a game changer. Super comfortable, no damage to the ring and lots of sizing options.