These are IKEA “Kirp” Metal Shelves… they don’t seem to sell them anymore, but I bought them about 3 years ago. You attach them with 2 screws, and the second part floats. They hold a surprising amount, unlike floating shelves. These held books, art, etc. They tend to be called “check mark” shelves because they resemble one. They’re all unmarked, in good shape. They did not, and do not come with screws… just standard threaded screws will work just fine. This is the price for all three, as a set.