Badminton racket stringing 22 x 21 recommended stringing tension max 11 kg head shape isometric levels advanced professional type of racket tournament racket balance 320 mm weight strung 92 g gewichtsklasse 3u 85 89g grip circumference 8 26 mm racket balance top heavy grip size g4 length 67 5 cm technology yonex nanometric season 2016 series yonex duora serie additional information the offers may vary in grip sizes material graphite fl