Thank you for viewing. Purchased from the official website. These are 24cm, but I have a different color, and my sister, who is 23.5cm, was able to wear them without any problem because the opening is elastic. Depending on the design, I subjectively think that someone who is 24.5cm might also be okay. Thank you very much. I am very sorry, but I will ship them without the box. Thank you again for your understanding.