The black knight magnum corona 6 squash racket that uses a new thermal core technology is an improved version of the black knight magnum corona squash racket it has been designed for advanced players or professionals who expect a racket that can sharpen and improve their control but also offers increased power and an easier swing the racket weighs 140 grams and is 27inches 685cm long it features head size of 475sq cm ashaway supernick xl micro string head light balance 14x16 string pa