This is a handle you mount to the rear axle of a childs bike. When they practice riding you can walk or jog behind them and hold onto the handle to prevent crashes. This is way better then training wheels which just teaches kids to trust the training wheels. Using this they learn actual balance. The handle just pivots up and down and has several adjustable lengths to make it easy on the adult doing the training.

　　I just finished using this to teach my youngest son and was able to jog along with him and then just let go when he was ready.