These are Keychains made with stainless industrial strength steel. They are hand-made and cannot be made by machine. Don't just think of them as just keychains. These will last a lifetime and will look exactly how they do today 100+ years from now. They will not rust, break, fall apart, or anything else you can think of without making an extreme effort to make it happen. A bigger version of this has been tested to take blows from knives, swords, and other sharp objects. Nothing has been able to penetrate this design. I do not recommend using this keychain for this purpose, but it displays the quality of the materials and work.
Own a piece of a lost art. You will be likely the only one within 100 miles to have anything like this. It also makes a great stress reliever if you press against both sides.
If you have ever been to a renaissance festival, you would see that similar, and potentially less quality, chains will go for between $15-$20. But here, you won't even pay half that. I'm nearly out of materials and once they are gone, they are gone.