Apacs Nano 9900 Badminton Racket (4U) Isometric 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. 76 Grommets system - This single-pass grommet holes construction provides more grommet holes, creating a high-performance stringing pattern that puts 7% more durability. Hi-Tension Light Weight Head - For powerful continuous drive, excellent control and defense against smashes. Control support Cap - The Control Support Cap provides 88% wider flat surface compared with an ordinary racket for better gripping, fast swing-through and the quicker maneuverability.