The Idea Tech a4OSR hybrid iron set is billed as the easiest-to-hit, most forgiving hybrid iron set in golf. It features dual tungsten perimeter weighting in the heel and toe, along with a magnesium crown that is 77-percent lighter than steel to provide more forgiveness and optimal launch conditions. It also includes the patented Boxer Technology that increases the Moment of Inertia for straighter, longer shots.