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Remember the xylophone, that fun, delicate musical instrument where each bar struck a different note? Add that same colorful music to your child's ball track set with our Haba Ball Track Sound Staircase, a 5-note xylophone designed in a stair formation for marbles to roll down. As each marble tumbles onto a step, it strikes a cheerful sound from the staircase, then goes on to the next. Sound Staircase ball track set also includes a bell, redirection block, and 6 marbles.