Hape Quadrilla Music Motion Marble Run Music Motion gives the classic marble run its own soundtrack by adding sounds. By strategically combining six sound bars with precision-machined birch track pieces and rubberwood construction blocks, builders can have their marbles accompanied by a unique melody. This cool run comes with 20 marbles. Specifications: Gender: junior Color: multicolor Material: wood, plastic Package dimensions: 34 x 52 x 8 cm (L x W x D) Age: from 4 years Contents: 77 Parts 20 Marbles 1 Handbook full of ideas