I purchased these on Mercari and used them for a piano recital. The 21cm size was used twice, and the 19cm size was used once. They are different sizes. Because they are white, there are black marks from walking. The 21cm ones are a bit more noticeable. Please check the images and purchase if you are not concerned. I am selling them because my children have outgrown them. Since there will be shipping costs, I would like to sell both pairs together. - Size: 21cm (with insole 20.5cm) - Size: 19cm (with insole 18.5cm) - Color: White Shipping is planned via宅配便 (courier service). Perfect for sisters, matching outfits, or children born a year apart.