You can combine them freely. Please let us know your desired colors in the comments. Set of 2 pairs: 1450 yen Set of 3 pairs: 2100 yen Set of 4 pairs: 2700 yen Set of 5 pairs: 3250 yen Set of 6 pairs: 3750 yen Size: Approximately 27cm-29cm Colors: A: White B: Black *As these are overseas parallel imports, there may be slight individual differences and quality issues compared to Japanese products. Also, as they are imported products, there may be slight fraying or loose stitching. *As these are overseas products, please refrain from purchasing if you expect the perfection of Japanese products. *Please note that the colors may appear slightly different on screen compared to the actual product.