Clubheads

COR stands for Coefficient of Restitution and describes the energy transference between club head and golf ball. If a club head has a high COR, this means less loss of energy. If a club head has a lower COR, this means more energy got loss during impact. A higher COR measurement means more distance.

MOI measurement is the resistance to twisting. A golf club wih a higher MOI is more forgiving at off-center shotsnand offers more stability at impact

Center of Gravity (or CG) is a single point inside the head, it is defined in 3 dimensions. If the CG is lower and farther away from the face, it will promote a higher trajectory or higher ball flight

Offset means that leading edge of a clubface is positioned in front of the hosel or neck. Offset design can help you to square the clubface for impact, increasing the chance of a straight shot

Most golfers believe that forged irons feel softer than cast irons. If two clubs are identical in every way (same specs, same shaft, same club length) except that one was made through casting and the other through forging, the forged one will not feel softer due to the carbon steel. What matters is that cast irons are cavity back design with perimeter weighting. the heavier sole promotes a higher ball flight and offers a game improvement design.