Some of the more significant portrayals of obsidian use involve blood-letting and warfare. One example includes the macuahuitl, a broad–faced club studded along its edges by obsidian prismatic blades. These weapons are predominantly used in ritual warfare and generally date to the Postclassic period. Earlier depictions of obsidian is usually restricted to their appearance as razors or lancets, and it is commonly believed that the material was not associated with weapons such as clubs or spears until later phases in Mesoamerica.