The tombak is a chalice-shaped drum carved from solid mulberry wood. It is covered at the wide end by a membrane of lamb or goat skin. The technique of this instrument uses both hands and consists of rolling and snapping the fingers in various ways. The rich variety of tones and textures on this instrument allows the player to punctuate and ornament the melodic phrases as well as create rhythmical patterns. 'Tom' and `bak' are onomatopoeias for two basic strokes, one low (tom) in the center, and one high (bak) on the side of the membrane.