Sim-Sala Kling brings musical fun to Kullerbu playtime! With lots of interchangeable parts, kids can alter the heights for maximum momentum and fun! The Sim-Sala-Kling Kullerbu set makes a get introductory set for the Kullerbu system. This adaptable and expandable ball track has super steep curves for Paul the ball to gain super-speed momentum. Features musical effects (xylophone stairs and ringing bell), 3 wooden balls and toppling dominoes.