Isometric square head shape - Developed by Yonex, the Isometric Square Head Shape provides a 32% larger effective hitting area than a conventional racquet. Unlike an ordinary racquet, whose main and cross strings vary in length, the Isometric Square Head Shape equalises the length of main and cross strings in the string bed and enlarges the 'sweet spot' for more consistent shot accuracy - even on off-centre hits. Graphite, Nano mesh and Carbon Nanotube make up the shaft of this racket keeping it flexible in feel.