The price of this model for children is 60cm long, suitable for children aged 5-8, and 70cm suitable for children aged 8-10, 880cm long, suitable for 11-15 years old . Can be mixed set, or can be installed in a single color. If you need to order a large number, please call fortune number: 15958909052. If you order any color, you can contact customer service directly. Because there are too many colors, they are divided into groups.