Callaway Quantum Max OS Iron SetThe Callaway Quantum Max OS Iron Set is engineered for golfers who want maximum forgiveness, effortless distance, and confidence inspiring performance from every iron shot. These oversized, game improvement irons are designed with a high MOI profile that helps maintain ball speed and accuracyeven on off center strikesmaking them ideal for golfers who struggle with consistency. The smooth, confidence boosting shape at address encourages a more positive