True Temper AMT Shafts are designed to maximize speed through a responsive tip design. Developed as an ultra-lightweight steel shaft design, players can expect increased clubhead speed. Wanting a shaft with more control and precision True Temper engineers started planning. In the end, AMT Shafts emerged. Each shaft gets a little bit heavier as the player moves to down through the shorter irons. Ascending Mass Technology lets the AMT offer player plenty of the of precision and control they need.