This modular bike was designed to train a child's coordination and balance, while also building leg muscle strength. The seat is adjustable in four directions and the patented handlebar can be adjusted both forwards and backwards. Aluminum alloy die-casting without any welding is used for the frame of the bike, which ensures excellent strength. Barely a single screw is used. You can switch between a two-wheel balance bike and a tricycle simply by changing the modules. This modular design also makes it easy to replace broken parts.