Flex Stiff Frame HM Graphite / POCKETING BOOSTER Shaft Composition HM Graphite / SUPER HMG / ULTRA PE FIBER Joint NEW Built-in T-Joint / T-ANCHOR Length 10 mm longer Weight / Grip 4U (Avg. 83g) G5, 63U (Avg. 88g) G4, 5, 6 Stringing Advice 4U: 19 - 27 lbs, 3U: 20 - 28 lbs Color(s) Grayish Pearl Isometric - Enlarged Sweet Spot ISOMETRIC technology continues to help the world's greatest players achieve global success. Developed over 30 years ago, the ISOMETRIC design increases the sweet spot by 7%. Compared to a conventional round frame, a square-shaped ISOMETRIC racquet generates a larger sweet spot by optimizing the intersection of the main and cross strings. ISOMETRIC delivers greater control without sacrificing power. ISOMETRIC is a Trademark of Yonex CO., LTD. Solid Feel Core - Cuts Vibration The built-in solid feel core cuts harmful miscellaneous vibration at impact. Solid feel core is carried in all racquets manufactured in Japan. Ultra PE Fiber The shaft is constructed using 'Ultra PEF' - ultra poly ethylene fibre - which is light enough to float on water yet able to withstand immense forces. These characteristics allow for maximum shock absorption. Slim Shafts - Reduced Air Resistance The slimmest racquet ever produced by YONEX vastly reduces air resistance whilst providing maximum feel. E. B. CAP Energy Boost CAP - Increased Control The new shape allows the shaft to flex, which ensures the maximum effect of "Namd (more flex and faster kick-back graphite material)" and stabilizes the racquet face by preventing the shaft twisting, increasing control. T - ANCHOR - Reduced Torque A new composite material T-ANCHOR used in the T-joint helps reduce excess torque when hitting an off centre shot. Super HMG - Super High Modulus Graphite Box Frame - The extra stiff profile provides a solid stable feel on impact with the shuttle. POCKETING BOOSTER - The frame is lined with POCKETING BOOSTER, a proprietary rubber-like material emphasizing elasticity in the frame's flex. CONTROL - ASSIST BUMPER The CONTROL-ASSIST BUMPER attached at the top contains T-ANCHOR, micro-sized tetrapods that help lock in vertical strings for improved accuracy.