Make those marbles sing and get ready for fun with this musical Marble Run add-on. Arranged in the correct order, these melodious musical step tracks work as building blocks to form a pentatonic scale!?

This Marble Run Add On Kit includes 1 track, 9 building blocks, 6 melodious blocks, 6 marbles which make it ideal?for experiments with sounds and tunes. Made from sustainably-sourced wood in Germany, these tracks and marble run components can?be combined with all HABA building blocks and HABA ball tracks.