Nanoscience - Engineering at the level of the individual atom, for increased repulsion power and speed. 30% More impact resistant, 10% More durability, 5% More power.The Yonex NANOSCIENCE uses nano-size particles of fullerene and carbon. The Yonex NANOSCIENCE provides sensitive control over how the racquet materials function at the molecular level. The process establishes a high-performance molecular bond of the materials and creates a stable, thinner and stronger head light racquet that delivers maximum power and speed. 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. Nanoscale Elasticti - Delivers high elasticity and high strength within the same recquet frame. Control Support Cap - Providing power and flexibility. Solid Feel Core - The shock absorbing compound loaded into the top of the frame reduces uncomfortable vibration, whilist the remaining solid feel allows precise control. LSC System - 15% less shock enhances your performance New Grommet System - Single-pass stringing, Grommet-Hole construction for a more durable frame +7% Muscle. Power - The close contact of frame and string allows full energy transfer 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: Stiff COMPOSITION FRAME: UHM Graphite / Micro Ti / Elastic Ti SHAFT: HM Graphite / Elastic Ti WEIGHT / GRIP SIZE: 4U (80-84.9g) G4 RECOMMENDED STRING TENSION: 19-24 lbs