You are strong! Maybe not using your nails to insert the key? π Of course I've only been using them for a few days so we'll see how they hold up over time, but they were ridiculously difficult to open to fit the keys and I don't expect them to feel like mine last keychain will stretch . They also came in two different sizes which was great for me. And I have a few extra ones so I changed the bf keyrings (more left) and he is happy with them too.
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