This is an abacus. The materials of the beads and frame are unknown, but it is a well-made abacus. There are minor scratches and wear from use, as well as changes due to aging. I confirmed that the beads move smoothly without any problems. I think it can be used for learning, as well as for old tools and retro goods. Please check the photos for the condition and only purchase if you understand that this is a used item.