Cast in bronze, it is an isosceles triangular plate shaped like a flat fish head or a flattened felt hat.
There is a round hole in the middle of the upper obtuse angle, which is used to tie the rope hanger or carry it by hand. The lower two symmetrical acute angles are tilted upward, and the bottom edge is slightly arced outward. The two sides of the board are cast with various patterns such as lines and clouds. .

The size of the board varies, and there are many specifications. The largest is 60 cm wide, 50 cm high, and 3 cm to 4 cm thick; the smallest is 10 cm wide, 7 cm high, and 1 cm thick. The bottom two corners of the board are slightly thicker, the middle of the two corners is slightly thinner, and the two corners are the knocking parts.
Chu use iron rods, dragon bamboo roots or wood. Bamboo or wood, the head is 21 cm long, the diameter is 10 cm, and the handle is 27 cm long. When playing, hold the rope with the left hand and percussion with the right hand. It can rotate with the help of the inertia of the tapping, and the sound waves are lingering and the reverberation is endless.