Tambor de Mola
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.
Trovão de Mola and Tambor de Trovão are spring drums with a skin on the back, creating a baser sound that resembles thunder.
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.