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. The new Yonex single-pass grommet hole construction provides more grommet holes at the 2 & 10 o'clock position on the frame, creating a high performance stringing pattern that increases durability by 7%. Nano mesh, Carbon nanotube and H.M. Graphite shaft, measns this racket has a stiff feel to ir, giving power and control.