' K/ K3 P$ s' L: @! L! L. _4 p 1 \# w8 z/ T/ j d1 k8 ^depends on the weight of the racquet, 2u or 3u. % C9 R7 V" z. i5 {1 \
just by browsing any online store, you can find that info. 7 L. x/ I: @5 I8 N5 q
ie. xin lan tian(in chinese) or mybadmintonsotre.com