With this hybrid iron set hitting the ball longer and higher has never been easier 588 altitude irons are fully interchangeable with 588 mid trajectory and tour trajectory irons so you can build your perfect setface forged technologyevery iron has a forged club face to enhance ball speed and feelengineered for altitudeseamlessly blended hybrid iron set makes every club incredibly easy to hit for maximum playability and performancefull hollow constructionhigh performance in a playable design