This Klimba building kit is designed as an extension to all sets. More components mean longer and more interesting rails.  With the two "mute tone plates", new rhythms with pauses can be built. 

Contents:
1 long rail, 2 short rails, 2 building elements, 1 building element with a passage for long rails, 2 building elements for notes, 2 mute tone plates

Visit Klimba's home site in Switzerland for additional images and information.  Ages 3 and up.  CAUTION:  Marbles can represent a choking hazard to very young children.