Unused "Hitsuji no Iranai Sheets Fire Boost". The size is single. The outer box has been opened, but the plastic packaging has not been opened. The plastic packaging is a bag shape with one side open, not a sealed one. When shipping, the shipping label will be affixed directly to this outer box. Please refer to the manufacturer's website for product details. https://hitsuji-zzz.com/products/htbs-003