It can be used for fun, to tap Children's Intelligence and to build their bodies etc. It can also be dismantied into pieces and stretched to agree_able lengthat your will. Its brake is sharp. Pulling the operating shaft in different ways can make it stop or move to any wanted directions. Sitting on it, with feet on the pedal, it can be freely headed forward or backrawd in auord with your children's actions. Thanks to its special design, moving at low speed does good to children's muscles, espcially to the muscles which are at their arms, backs, waists and legs. All that is benificial for children's growth.