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Pellet drums, or rattle drums, are a class of membranophone, or drum, characterized by their construction and manner of playing. They have two heads (either a single double-headed drum or two hemispherical single-headed drums joined together with the heads facing outward), and two pellets, each connected by a cord to the drum. The damaru, which is used in Tibet, Mongolia, and India, is an hourglass drum that is grasped by its waist and twisted back and forth, causing the pellets to strike the heads in a rhythmic fashion.photo In China, Korea, and Japan, pellet drums are affixed to or pierced by a vertical rod or pole, and, depending on the instrument's size, the rod or pole is twisted either with one or both hands or between the palms, causing the pellets to strike the heads in a similar manner.photoPellet drums may be either hourglass shaped or barrel shaped. In some cases, multiple drums are mounted on a single rod.photoAlthough pellet drums are often used in religious ritual (particularly Tibet, Mongolia, India, and Taiwan), small versions are also used in East Asia as children's toys or as noisemakers by street vendors. Such small versions are sometimes also referred to as rattle drums.