The completely new, improved Nanoflare 800 PRO racket is a model designed for the most demanding players. The racket's design combines, among other things, a wide profile frame and string layout with the Enhanced Sonic Flare system, which uses a steep angle between the stringing area and the T-joint to increase stiffness, ultimately increasing take-off power.Specification:Stiffness: StiffFrame: HM Graphite, M40X,SUPER HMG, CopperShaft: HMG, CopperJoint: NEW Built-in T-JointLength: 10 mm longerRecommended tension: Control - Exbolt 63 ; Power - Exbolt 65Color(s): Deep GreenManufacturer code: NF-800PTechnologies:AERO FRAME - AERO Frame reduces air resistance and allows for a faster swing.ISOMETRIC - The isometric shape of the racket head maximizes the area of intersection of the main and cross strings, thus increasing the active hitting area even for off-center hits.M40X - A very strong yet flexible next-generation carbon fiber developed by Toray Industries, Inc.SONIC FLARE SYSTEM - Maximum acceleration. Revolutionary new TORAYCAR M40X graphite material and SUPER HMG provide unrivaled power and stability for maximum acceleration.ULTRA PE FIBER - The shaft is constructed of "Ultra PEF" - an ultra-polyethylene fiber - that is light enough to float on water, yet able to withstand enormous forces. These features allow for maximum shock absorption.SUPER SLIM SHAFT - The thinnest racket ever produced by YONEX significantly reduces air resistance while ensuring maximum feel.ENERGY BOOST CAP - The new shape allows the shaft to flex, providing maximum racket stability, preventing shaft twist and increasing control.NEW BUILT-IN-T-JOINT - The lightweight T-Joint increases the stability of the shuttle on the strings, maximizing power and control.