Features Idea a3 is a hybrid iron set with a revolutionary mix of high performance and forgiveness 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 3, 4 and 5 Boxer(tm) hybrids: designed for maximum forgiveness and performance; category leading MOI delivers a new standard in distance and accuracy never before achieved in hybrid design 6-7 hollow-back irons: easy-to-hit hollow back design with progressive offset transitions the launch conditions between the Boxer(tm) hybrids and cavity-back short irons for consistent and even gapping 8-pitching wedge cavity-back irons: reshaped for maximum forgiveness and playability Steel shafts