This racket is designed for Advanced players looking for immediate access to power to maintain a relentless attack. Product Description: Featured Technologies AERO+BOX Frame, BLACK MICRO CORE, Energy Boost CAP PLUS , Hyper Slim Shaft , ISOMETRIC, Namd, NANOMETRIC, New Built-in T-Joint, New Grommet Pattern, Rotational Generator System, Solid Feel Core Flex Extra Stiff Frame HM Graphite / Namd / Tungsten / Black Micro Core / Nanometric Shaft HM Graphite / Namd Length 10 mm longer Weight Grip Size 4U5,6/3U4,5,6 Color Dark Navy Recommended String Control Players: AEROBITE BOOST, Hard Hitters: BG55 FORCE Stringing Advice 4U 20-28 lbs, 3U 21-29lbs Made In Japan Item Code AX100ZZ Astrox 100 product video: https://youtu.be/OkxBUru7luw Product Technology ROTATIONAL GENERATOR SYSTEM By applying the counterbalance theory, weight is distributed throughout the grip end, frame top and the joint for maximum control. The transition to the next shot can be performed smoothly, with rapid succession. NAMD Utilizing high quality Namd graphite throughout the frame produces more flex with a faster snapback, unleashing dramatic steep power. Hyper Slim Shaft Designed to slice through the air, generating speedy power Energy Boost Cap Plus The new shape allows the shaft to flex, which ensures the maximum effect of “Namd[1](more flex and faster kick-back graphite material)” and stabilizes the racquet face by preventing the shaft twisting, increasing control Isometric™ The ISOMETRIC™ equalizes the length of the main and cross strings in the string-bed, enlarging the sweet spot for more consistent accuracy even on off-centre hits. New Grommet Pattern The single-pass grommet hole construction provides more grommet holes for a more high-performance stringing pattern. Soft Feel Core The built-in solid feel core cuts harmful miscellaneous vibration at impact. Solid feel core is carried in all racquets manufactured in Japan. AEROBOX Frame Combines solid hitting feel and quick swing. NEW Built-in T-Joint ‘NEW’ Built-in T-Joint is manufactured from a special lightweight plastic combined with epoxy resin and foaming agent that enhances quality and performance by increasing the stability of the shuttle on the string bed and through the air. NANOMETRIC NANOMETRIC* improves the bonding strength between the carbon fibres enabling us to take racquet shaft construction to another level. By reducing the amount of carbon in the shaft to make it 60%* thinner than a conventional racquet whilst retaining stiffness, YONEX has created a revolutionary lightweight racquet with lightening head speed and control. *NANOMETRIC is the new material which applies the NANOALLOY™ Technology of Toray Industries, Inc. Black Micro Core Used for the first time in Yonex badminton racquets, BLACK MICRO CORE is a stiff, high-density vibration-dampening material equipped into the upper part of the VOLTRIC FB frame letting players hit with solid feeling and power.