The mechanism is surprisingly clever and easy to use, so the ring opens and you can add and remove keys whenever you want. The ring itself is thin enough that you can also fit car keys, so it works with almost any kind of key. At the same time, it is durable, without deforming, but precisely because it is a ring, it does not take much force anyway, and I believe it will last a long time. With the other modern key holders not being suitable for the keys of... Greek realities, this is a very convenient solution. In the black color, the anodizing looks good. After a few months of use, it is not like it was new, but there are still no visible signs showing the steel underneath.