The TaylorMade Golf 2021 M4 Combo Hybrid Iron Sets were designed to lower scores. M4 Hybrids replace those hard to hit and seldom used long irons, while the easy to launch M4 Irons will get you closer to the pin for more birdie putts. Speed Pocket technology improves low-face flexibility to deliver more ballspeed in the key area where golfers commonly mis-hit.Ribcor technology for efficient energy transfer at impact.Advanced sole design that provides the bounce and glide of a wider sole but in a narrower, more workable shape.Optimized heel-toe weighting significantly increases MOI for more forgiving, more stable irons.M4 Hybrids replace those hard to hit and seldom used long irons!Set Configuration: 4H-5H, 6-PW (7 Clubs) with Atmos graphite Shafts in hybrids/KBS Max 85 steel in Irons.