A teponaztli is a type of slit drum used in central Mexico by the Aztecs and related cultures.
Teponaztli are made of hollow hardwood logs, often fire-hardened. Like most slit drums, teponaztlis have two slits on their topside, cut into the shape of an "H". The resultant strips or tongues are then struck with rubber-head wood mallets, or with deer antlers. Since the tongues are of different lengths, or carved into different thicknesses, the teponaztli produces 2 different pitches, usually near a third or fourth apart.
(engelska Wikipedia, läst 180716)