Cleveland Golf 588  MT Iron Set Engineered for Mid Trajectory Constant blade length throughout set, blade height progressively increases in higher-lofted clubs Full Hollow Construction; High performance in a playable design Face Forged Technology; Every iron has a forged club face to enhance ball speed and feel Vibration Dampening; Multi-material insert of polymer and aluminum in iron plaque dampens vibration at impact for more consistent feel Easy-to-hit long irons are blended with more traditional short irons