I don't remember exactly when I bought it, but it was at least 5 years ago, I think. I remember buying four of them together. I've been using it with the product label still attached. There are some scratches and dirt, but I don't think it will stain books. Size: 12.9cm x 7.9cm x 7.3cm Since it exceeds 7cm in thickness, I plan to ship it via Takkyubin 60 size.