I purchased this item, but I'm not using it now, so I'm putting it up for sale. It has been stored at home for a while, and some air has leaked out. It is not punctured. You will need to inflate it, so please be aware of this. Thank you. Retail price: ¥1,540 Size: Approximately 13cm in diameter Also, I will deflate it for shipping, so thank you for your understanding.