23.5 cm I think you can still use them without any damage. Please feel free to ask any questions you may have. ★ These items are stored at home, so please refrain from purchasing if you are nervous or expect perfection. Returns are not accepted to prevent product switching. ★ (Returns will be accepted if the issue is due to our fault) ★ Please excuse any wrinkles due to storage and packaging. ★ We have checked carefully, but please forgive any oversight of stains, etc. If you are sensitive to the condition, please refrain from purchasing. ★ There are individual differences in how people perceive the design and condition of the products. ★ If you have any questions or concerns, please feel free to comment.