Extrema Ratio
The Extrema Ratio - Instructor Zero Limited Edition knives are a salute to the Paratroopers of the Italian Armed Forces. The limited-edition series is based on an original design of the "ZERO" model and was produced in partnership with anti-terrorism specialist and teacher Luciano Gligoris. Experts produced the Zero series in collaboration with INSTRUCTOR ZERO, one of the most recognized close combat teachers. It is a one-of-a-kind collection of Karambit and fixed blade knives for individuals who wish to be entirely prepared for any physical conflict.