EQUS golf irons are MOI (Moment of Inertia) matched for each combination in each set. The result is a progressive swing weight, constant within each individual combination, and progressive in subsequent combinations.
MOI is the force necessary to initiate the motion of a stationary object about an axis. In EQUS irons the axis is both the center of gravity of the club head and the pendulum created by the entire club. EQUS clubs utilize both of these matched forces to improve consistency within any given combination.