The surdo (pronounced zerdoo) is a large bass drum used for playing the lower parts of the percussion section. It often comes in three different sizes or tones. These can be referred to as the low/mid/high or the 1/2/3 respectively.
CAIXA
Often know as the Brazilian snare this drum differs from a standard snare drum by being played with the snare on top, rather than underneath. Usually played with drumsticks, it is easily identifiable by its powerful, staccato sound.
REPiNIQUE
The repinique is a two headed drum often used to lead a bateria - tuned high to cut through the rest of the music. It can be played using a combination of a short wooden stick and a hand or with long whip sticks.
AGOGO BELL
A two-toned bell, played with a single wooden stick , used to create sometimes complicated multi-tonal patterns. Makes up part of the 'cutlery' section of the bateria.
TAMBOURIM
A small, round drum, often only 6" in diameter. Tuned tightly to produce a loud, sharp sound it can be played using a wooden stick or a beater consisting of several nylon threads. A variety of different strokes can be used to produce varying sounds.