Children's bicycles are usually made of materials such as high carbon steel, aluminum alloy, or carbon fiber, which have the characteristics of high strength, corrosion resistance, and lightweight, making them very suitable for children's cycling. At the same time, the design of children's bicycles also emphasizes safety, such as being equipped with protective wheels (balance wheels) to help children maintain balance, as well as a frame and seat design that conforms to children's ergonomics.