Power Armor System - by using advanced hybrid material developed by Yonex to enhance the racquet frame's acceleration of gravity' performance. The result, Armortec recquets generate 4% more speed, better face stability and provide a robust 'metallic feel' on impact Control Support Cap - Providing power and flexibility Ultimum. Ti - A powerful nickel-titanium alloy developed by Yonex and positioned within the racquet's shaft, makes a big impact on the court Isometric - Provides a 32 percent larger effective hitting area than a conventional racquet Built-in T-Joint - Moulded deep into the layers of graphite where the frame connects with the shaft, the Yonex Built-in T-Joint creates a durable and high-strength one-piece frame that is torque-free. The patented construction results in more power and more accurate hits FLEX: Extra Stiff COMPOSITION FRAME: UHM Graphite/g. Force Ti SHAFT: HM Graphite / Ultimum Ti WEIGHT / GRIP SIZE: 3U (85-89.9g) G3 RECOMMENDED STRING TENSION: 20-25 lbs