Check the listing for details. Rapport Core Blue Graphite Hybrid Golf Club Shafts. Color: Black, Condition: New. Listed at 39.99 USD. Rapport Core Blue Graphite Hybrid Shafts THE NEW CORE BLUE BY RAPPORT 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. 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 0° and 90° planes.