Apacs VANGUARD 11 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. Triple Speed System Frame - The Triple Speed System is developed to achieve the combination of heavy smashes and speedy racquet handling. Resulting in instant power during smash and making a full swing easy during short range rallies. Compact Frame - Provides fast swing and head-heavy balance. The frame has been made smaller to maintain the fast swing demanded by advanced players. By reducing the drag caused by air resistance, the head-heavy feeling is reduced and racquet handling speed is increased. Extra Slim Shaft - Cutting edge nano carbon technology is used to produce an ultra-thin, aerodynamic shaft, created for a stronger and more intense shot.