HIGHEST M.O.I. promotes straighter shotswith Maximum Twist Resistance. Patented Extreme Polar Weight System (patent number 5,335,914) creates an extremely high M.O.I. Low Center of Gravity due to the wide, cambered sole promoting a higher ball flight. Pro Silver, ultra light steel shaft by FST a revolutionary lightweight 100 gram shaft with superior launch and spin characteristics. Irons Included: 4, 5, 6, 7, 8, 9, PW, GW.