This toy is a combination of the basic xylophone and a hand-crank that works together to function as a interactive music box.
The child can adjust the black pins on the music barrel to create different patterns that will play a certain tune. The little black pins can be pushed in or pushed out with an audible clicking noise. The child can play the tune by turning the hand-crank clock-wise.
a brief discussion of construction cost, durability and safety: The hand-crank and barrel will most likely be made with durable, polished wood. Inside the barrel is a system of springs, similar to how a ball-point pen works. The xylophone keys would be made of fiberglass-reinforced plastic, and the mallets would have a hard rubber head and wooden body.
