Cleveland Golf Men's Black 2015 Iron Set (7-Piece), 4-PW, Left Hand, Regular, Graphite The CG Black irons incorporate the Low Swing MOI and a thin, high-strength steel club face that greatly increases COR to give you greater distance These irons have an increased head and ball speed which results in more distance By making club weight lighter, CG BLACK 2015 Irons are easy to swing faster Higher launching and longer carry distance will lead to lower scores