Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
The redoba is a percussioninstrument.
It consists of a wood block fixed to a belt and struck with sticks. A pair of blocks can be used to obtain two different musical notes. It is possible to dance and play at the same time. It is mainly used in conjunto norteño.
References
Chamorro, Arturo (1984). Los Instrumentos De Percusión En México. México: Colegio de Michoacán. ISBN978-968-7230-02-3.
INAH (1988). Atlas Cultural de México. Música. México: Grupo Editorial Planeta. ISBN968-406-121-8.