The drum has five faces and different sounds. There is a circular hole for sounding on the back of the drum. Some of the modern drums are equipped with steel wires inside, which makes the sound more characteristic.
Now Cajon has become a musical instrument used in modern music. Cajon is easy to be modified. In addition to the usual placement of strings, there are even drums or modified Kalimba, and some drums are added to increase the performance. Diversity.