Tambor de Mola is gourd made of Cedar wood, with a spring attached to the bottom. It is played by making the spring vibrate and by manipulating the vibrations exit through the opening in the bowl.
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Trovão de Mola and Tambor de Trovão are spring drums with a skin on the back, creating a baser sound that resembles thunder.
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Tambor Sideral is a spring drum made with a gourd that grew up in a clamp, providing a special shape. It has this name due to the "Outwordly" sound It produces.