Flex Power Saber Blade Badminton Racket (6U) Isomectric head frame - Equalizes the length of main and cross strings in the stringbed, enlarging the sweet-spot for more consistent accuracy even on off-center hits. Light Weight - At 81g (5U) this light weight racket will enable you to move quickly and deliver fast swing to surprise your opponent. 76 Grommets system - This single-pass grommet holes construction provides more grommet holes, creating a high-performance stringing pattern that puts 7% more durability. Aero + Box Frame - Combines solid hitting feel and quick swing.