Introducing Core Blue by Rapport Golf. The perfect balance of high performance, consistency and reliability. Each shaft is specifically designed utilizing our Zone Frequency Profiling technology that optimizes shaft frequency, weight, torque, profile, launch and spin, to help each golfer hit it as long, as straight and as consistent as possible. The Core Blue line has options for every golfer ensuring the right fit. Fit & Design: Designed with 4 distinct zone frequency profiles (zfp technology), optimizing performance for players that fit into each weight and flex category Manufactured using high modulus materials designed to enhance feel and consistency 100% frequency tested in both 0Adeg and 90Adeg planes Engineered and built to provide the best combination of distance and accuracy in todaya (TM)s modern hybrids