ARCSABER 2 CLEAR (PRE-STRUNG)ARCSABER 2 CLEAR AERO+BOX Frame A combination of faster swing speeds and a solid feel. ISOMETRIC Enlarged Sweet Spot ISOMETRICTM technology continues to help the worlds greatest players achieve global success. Developed over 30 years ago, the ISOMETRICTM design increases the sweet spot by 7%*. Compared to a conventional round frame, a square shaped ISOMETRICTM racquet generates a larger sweet spot by optimizing the intersection of the main and cross