I purchased these as individual samples. They seem to be buttons made of a rare material, and were expensive, costing between 2,000 and 4,000 yen each. I bought them for a total of 15,000 yen, but I won't be using them, so I'm offering them for sale. They are completely unused, so they are considered new, but please refrain from purchasing if you are concerned about minor details, as they have been stored at home.