7 e" x7 l* i# C( Q: \( z& L
* m- y. M0 E- v' z1 f
depends on the weight of the racquet, 2u or 3u. % K7 `5 X: }& g5 g$ kjust by browsing any online store, you can find that info. + b9 j8 ]& |# M& O+ P6 ]
ie. xin lan tian(in chinese) or mybadmintonsotre.com