The RB566 is an even softer feeling version of its predecessor with a new micro-dimple configuration to maintain hang-time past the apex of flight. With a softer yet higher energy core, the RB566 offers a great balance of high trajectory, soft feel and all-round performance. TECHNICAL DETAILS New High Energy, Soft Feel Core Micro / D-Dimple Design for Added Hang Time Durable lonomer cover. Keep your game sharp with this reliable, comfortable, and stylish gear — made for modern golfers who want performance with personality.