Yonex VCORE 98 (285) Flame Red Tennis Racquets : Beconing in the "New Shape of Spin" the Yonex VCore 98 (285) tennis racquet features the advanced technologies needed to help players implement speed and spin into their game. The ISOMETRIC technology helps to create a 7 percent larger sweet spot to maintain power and improve control. New Aero Fin technology just above the throat helps give players a faster and thinner frame. Lastly, NAMD graphite technology provides a unique flex and fast snapback from the frame, helping to make your shots just a little harder to return. Features a square-shaped ISOMETRIC frame. Features optimal maneuverability from Aero Trench technology. Offers impressive controlled power, speed, and enhanced spin capability.