The Carlton Kinesis X90 Badminton Racket is the racket of choice of Nathan Robertson and designed for players to attack with high force using a short swing. Ideal for advanced offensive players. Kinesis - 90 degree twists at 2, 5, 7 and 10 o'clock to reduce weight and acts to increase swing speed witht the Vortex Geometry. Vortex Geometry - A new design of the racket head to help improve the aerodynamics of the racket throughout the whole swing. Most rackets are designed with excellent aerodynamics in a single plane, the Vortex System is designed to have excellent speed through a whole rotation. Xtreme Tension Frame - Attention to detail and high quality materials ensure that Carlton rackets are safe to be strung at higher tensions. Micro Grommet System - Smaller tapered edge grommets that sit in a groove in the frame reduce aerodynamic drag by allowing the string to sit closer to the frame. Optimetric Headshape - the sweetspot has been increased by the isometric geometry and the airspeed and control increased by the small head geometry. This headshape provides power, speed and control.Racket has been strung ZYMAX-65 string at 25lbs tension.