Yonex's current mainstream racket series: NR speed series, VT attack triangle series, NS balanced ball control series.
The most classic of NS series is ns9900: it is mainly a balanced ball control racket, which is suitable for controlling the ball and does not require high physical strength. Those who are suitable for pulling and hanging, please do not choose those who like to attack again.
The most classic NR series are nr900 and nr800: mainly doubles rackets. 900 is the next generation of 800, endorsed by Ashan and Hendra in Indonesia. Both of them are doubles beats, with fast rebound in the middle stroke, suitable for flat draw and fast block, fast return rhythm and crisp ball, which is not so suitable for singles.
The most classic of ZF attack series is zf2: it is a typical single shot, top-heavy, with high balance point, suitable for singles players with good physical fitness, suitable for singles attack, strong killing power and particularly obvious sense of head-heaviness.
Now there is a new series, doura double-edged series endorsed by Li Zongwei. Racket has two different faces, double-edged ten, double-edged seven and double-edged six.
There is no simple distinction between good and bad rackets. You should choose a racket according to your physical quality and playing style. Only the one that suits you is the best racket.