The guzheng (Chinese: 古箏), also known as Chinese zither, is a Chinese traditional plucked musical string instrument with over 2500 years of history. The modern guzheng usually has 21 strings with a length of 64 inches. The guzheng has a large resonant cavity made from Wutong wood (Paulownia elongate).[clarification needed] Other components often are made from other woods; usually for structural and decorative purposes. Performers playing the guzheng often wear finger picks on right hand or both hands. The picks can be made of different materials such as Ivory, tortoise shell, resin and hard plastic.