Isometric technology allows for a larger sweet spot which 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. Tested by Yonex Liner Tech allows for Improved Power and Comfort. Straight hole grommets elongate the strings to optimize power and comfort on off-centre shots. M40X Power with a More Flexible Frame. A strong, elastic graphite is added in the throat to improve frame stability and flex. Oval Pressed Shaft (OPS)Increased spin and control. Shaft corners are rounded for an ideal flex at impact to increase dwell time for optimal spin and directional control. Vibration Dampening Mesh allows for added touch and precision. A stretchy mesh material is wrapped around the graphite within the grip to filter unwanted vibrations. Shockless Grommets are integrated at the side and bottom of the frame to minimize muscle fatigue and provide a soft feel at impact to protect the wrist, forearm, and elbow by absorbing shock. Enhanced Sweet Spot allows for an updated square-head frame that is wider at the 3 and 9 o’clock positions create the largest sweet spot in EZONE history.