Cleveland 588 TT (TOUR TRAJECTORY) Irons Take your accuracy to a new level with tour-caliber flight and feel. 588 Tour Trajectory Irons are fully interchangable with 588 Mid Trajectory and Altitude Irons so you can build your perfect set. ENGINEERED FOR MID TRAJECTORY Constant blade length throughout set blade height progressively increases in higher-lofted clubs. Easy-to-hit long irons are blended with more traditional short irons.ENGINEERED UNDERCUT Modest cavity back with engineered undercut improves ball speed and accuracy on off-center hits.FACE FORGED TECHNOLOGY Every iron has a forged club face to enhance ball speed and feel.VIBRATION DAMPENING Multi-material insert of polymer 3109883935632