Special features: Isomectric head frame Equalizes string and cross string lengths on the cord, enlarges the sweet spot with more consistent accuracy even on off-center clicks. Grommet System This single-pass grommet hole construction provides more grommet holes, creating a high-performance printing pattern that provides 7% more durability. High Speed Frame The High Speed Frame design is an aerodynamic hexagon shape frame designed to reduce drag on the frame during a straight swing or hit. Provides fast turns and faster maneuverability. Reinforced Structure Frame New materials are adopted in the frame frame to create Ultra High Strength & Stiffness frames.