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: Engineered and designed to optimize distance and create tighter dispersion 100% frequency tested in both 0Adeg and 90Adeg planes to ensure radial symmetry, providing precise, consistent feel and repeatable performance Manufactured using high modulus, exotic materials that were developed to enhance feel and consistency Each weight and flex are designed with unique launch and spin characteristics geared to match the players individual swing profile Specifically designed utilizing zone frequency profiling technology that optimizes shaft frequency, weight, torque, profile, launch and spin, resulting in a high-performance shaft that can help each player type optimize their performance