WHAT IS MOI?
TECHNOLOGY DETAIL – 10K MOI FORGIVENESS
MOI stands for Moment Of Inertia. It is a measurement of stability, measured in g-cm2

WHAT DOES MOI DO?
The higher the MOI the greater the resistance to twisting on off-center hits. When the
club twists, energy is lost. Reducing twisting helps with both accuracy and ball speed
retention on off-center hits.

IS THERE A LIMIT?
In 2006, with the advent of square drivers, the USGA implemented an MOI limit of 5,900
g-cm2.

THEN WHERE DOES 10K COME FROM?
The 5,900 g-cm2 only applies to the MOIy, which defines heel-toe forgiveness. The ‘new’
measurement includes the MOIx, which defines up-down forgiveness.

MOIY + MOIX = MOI10K