Golf Shop: TRUE TEMPER Black Gold .355 Iron Set

"Utilizing True Temper s proprietary manufacturing processes, Black Gold s critical shaft parameters are held to exacting standards, resulting in a frequency tuned product that combines a stepless design with the unmatched quality and consistency that is the essence of True Temper s gold heritage. The consistency of the raw blank is held to within +/- 1.5 grams and the raw requency is controlled to within +/- 2 cycles per minute."