• plastic
• Auditory training :perfect present for your , it's funny and interesting also, this is a nice teaching tools for preschool,sound tubes
• Musical instrument for :rigorous process, selected good material manufacturing, seemingly simple, but everywhere is delicate, musical instruments
• Sound cylinders:you can put objects inside the cylinder, which can be shaken to produce sound and distinguish sounds,
• Thinking training for :funny and creative, hands and brains developed together, very funny and useful it can distinguish through sound tube, training hearing ability, learning
• instrument:they are strong enough, not easily deformed or broken, and can serve you longtime,cylinder musical