... Frog Swing scooter(Speeder). 2.S, M and L 3 different sizes. 3.Original manufacturer. 4.EN71,SGS and CE. BACKGROUND INFORMATION: The ... the floor. Forward motion is achieved by shifting the rider's body weight back and forth between the foot boards.As ... weight forces are applied, the pressured wheels will swing in "S" shaped movement similar to a fish tail, resulting a forward ...