Idea a3 is a hybrid iron set with a revolutionary mix of high performance and forgiveness. The hybrids feature breakthrough shaping and offer a category-leading Moment of Inertia (MOI), which is up to 70% higher than the other leading hybrids in its class. This emphasis on hybrids, along with the transitional mix of hollow-back mid irons and cavity-back short irons takes hybrid iron set design to a new level