The irons modern head shape combined with the Speed Channel delivers higher speeds across the face and yields the best combination of distance, forgiveness and feel. The remarkable feel comes from the harmonic cavity insert that includes an engineered Thermoplastic Urethane insert positioned directly behind the impact zone for vibration damping and improved feel at impact. Combine this with extremely deep cavity undercutting and heel and toe weighting (Zone Weighting Technology), and the Fly-Z irons are true game-changers. Combine the irons with two easy-to-hit hybrids featuring a low, back CG placement, the Fly-Z Hybrids are designed for forgiveness and deliver the optimum combination of a low center of gravity and higher ball speed. This position combined with the Speed Channel Face provides even more ball speed and greater distance on off-center hits.