Elements Chrome Recoil technology optimizes spring effect and promotes the highest and most efficient energy transfer from butt to tip to maximize ball speed and reduce ball dispersion. Variable Wall Thickness within each section of the shaft for enhanced feel and better control and accuracy. Counter balance design to produce manageable swing weights for today’s heavier heads. 55 produces mi/high trajectory, 65 (R,S) produces mid trajectory, 65 (TS, TX) produces low/mid trajectory. Trimming Instructions