Knives vary depending on their provenance.
They can have little or no decoration and can be of different metals or made of two metals. The best known are the tumis from the Sican culture, which have a straight or trapezoidal handle and a half-moon blade. The solid handle may have carved or stamped designs. Generally they are made of gold, silver, or copper. In ceremonial examples, the blade and upper part may depict an human figure standing or seated, or simply a face or mask with an elaborate headdress, earspools, and inset semi-precious stones.