Badminton racket head shape isometric level professional type of racket tournament racket playing properties power weight unstrung 85 g gewichtsklasse 3u 85 89g 4u 80 84g grip circumference 7 94 mm racket balance top heavy grip sizes g4 g5 technologies yonex e tune system yonex nanometric season 2015 series yonex voltric serie additional information the offers may vary in grip sizes materials graphite tungsten flex rigid