What are the keys on a gockspiel made of?

The keys on a guzheng, a traditional Chinese stringed instrument, are typically made of materials such as wood, bamboo, or metal, depending on the design and craftsmanship. The choice of material affects the instrument's tone and resonance. In some modern guzhengs, synthetic materials may also be used for durability and consistency. The keys are often carefully tuned to produce specific pitches when plucked.