The vibration dampening inserts give these clubs a great feel when hitting the ball. With the highest moment of inertia (MOI) Nike has ever attempted in a mixed combination set of hybrid and irons. The sets provide four hybrids, 4 through 7, and four irons, 8 through AW, without losing any distance control between clubs. The longer blade and lower center of gravity increases the stability of the club head at impact. Depending on your swing speed you can get the extra-stiff, stiff or regular shafts along with the Nike Rubber Composition grips.