Features: High quality materials: Made of coconut shell, environment friendly, durable and free from deformation and corrosion. Wonderful sound: With the box design, the resonance is strong and the sound is more full, melodious and lasting. Tuning rules: With 7 keys of metal tines, the longer the key, the lower the tone. The shorter the keys, the higher the sound. Wide applications: The best choice for performance, recording, family, outdoor, school, party, and relaxation and so on. Easy to learn: Comes with colorful appearance and exquisite workmanship, attractive for beginners and kids to learn fast.