A reconstruction of the Aztec macuahuitl — a flat wooden club edged with obsidian blades — rebuilt using synthetic obsidian-composite inserts set into a carbon-lattice frame. The Black Teeth's cutting edges are sharper than surgical steel, capable of edge retention that natural obsidian cannot achieve, and mounted in a frame that will not shatter under impact as traditional wooden versions did. The weapon combines pre-Columbian design philosophy with 23rd-century materials science.

Each obsidian-composite insert is 8 centimeters long and 2 millimeters thick, set into machined slots along both edges of the paddle-shaped frame. The inserts are designed to be sacrificial — they chip and break on hard impacts, but each broken insert exposes a fresh cutting surface, and the weapon carries enough inserts (24 per edge) that it remains effective through extended combat. Replacement insert strips cost Φ40 and snap into the frame without tools.

The Forge-Smith Collective began producing Black Teeth at the request of a martial arts instructor with Nahua heritage who wanted to demonstrate that indigenous weapon designs had genuine tactical merit beyond historical curiosity. The weapon's performance in controlled testing — it outcut several corporate vibro-blades in unassisted cutting trials — silenced skeptics and created demand that the Collective struggles to meet. The macuahuitl has returned to GLMZ not as a museum piece but as a functional combat weapon.