Material:Bamboo, Bamboo that is more than 4 years old and has been air-dried for more than 3 years Round finger holes: The tuner has manually adjusted many times, the appearance is round and the sound is good Plain paint: 3 times of sanding, 3 times of varnishing, the body of the flute is bright and shiny Red paint inside: The inner chamber is red, and the production process is meticulous Hand tied: the coil is tight and meticulous, non-slip and crack-resistant, and the black coil is full of quality