Bg65 is just like a type of your string. I mean there r Bg80,
BG65 etc.
It's a yonex string. Unless you're really competitive, than the
string type matters...if you're playing for leisure, i doubt the
string will matter at all.
As for rackets, it's not the lighter the better. It's the balance
of the racket and it's ability to generate power. With today's
technology, creating ubberly light rackets is cheaply possible, but
who wants to play with a racket that feels like a feather...
And today's more popular rackets by Yonex are all head-heavy
based...and most of the are not light at all.