Unlike regular shoelaces, you can use multiple colors! I'm using the rainbow ones for kids, and people always say they're cute when they see them for the first time, so I recommend using multiple colors! You can change the color combinations. Please comment if you're interested. Approximately 4cm to approximately 6cm - 6cm - - 5.5cm - - 5cm - - 4.7cm - - 4.5cm - - 4cm - 1 set contains 12 laces (6 laces per foot) Please refrain from price negotiations. There may be folds or wrinkles in the packaging. The packaging bag may open. Please understand. #PurpleShoelaces #PurpleFashionItems If your shoe size is small, adults can also use them. I was able to use them on 23cm sneakers. It depends on the design, so it's not guaranteed. Please understand.