This is a scratcher-type instrument. Most are made of either a metal box with ridges cut into the top side or a metal tube with springs extended across its length. They are most commonly used in Escloas de Samba. It mostly resembles the effect that scratching a washboard would have and is played by sliding a metal, wood or rattan stick against the ridges. The stick almost never leaves the ridges. Patterns consist mostly of continuous eighth notes with additional pressure for the accents. Where quarter notes appear, the scratches should be longer.