The dobrão is a thick stone or coin used to play the berimbau. It is used to change the tension on the arame or string, in order to change the pitch and quality of the sound being played. The dobrão can also be called pedra (stone) or moeda (coin).
Vauxhall, NJ, USA
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Nicole Wines, “Stone Dobrão,” Raíces Cultural Center Digital Archive, accessed June 1, 2023, https://archive.raicesculturalcenter.org/items/show/2011.