Thank you for viewing! These are Doctor Yellow train socks, also known as Tetsushita. The size is 16-20cm. They are new, unused, and unopened. I bought them at the Railway Museum, but my child was satisfied with just buying them and didn't want to wear them. The Shinkansen boom has also passed. How about these for a little train enthusiast or a child who loves Shinkansen? These are the very popular 923 series Doctor Yellow. They will be delivered with secure, anonymous shipping. I hope you have a wonderful connection with this item!