This bike can help children quickly master riding skills under safe conditions. The 18″ wheels are not only non-slip but also adaptable to different roads. Two auxiliary wheels can improve the overall stability of the bicycle. In order to keep up with the growth rate of children . we designed the auxiliary wheels to be detachable to meet the different needs of children of different ages. In addition . we strictly select high-quality carbon steel materials to ensure the durability of the bicycle. The adjustable handlebars seat grows with your child . quick release seat for easy height adjustment . you will get a custom seat height. The enclosed chain guard prevents ankles from catching. Simply pedal backward . the kid’s bike will stop. Exercise is the nature of children . and cycling can promote children’s sports. Perfect for the kid’s gift . children will love this bike very much.