Hi everyone, i have an old racquet (yonex carbonex 7000 DF). The string is a dunlop g force 68 or 65 (can't really read it). My father bought this racquet about 3-4 years ago and i am sure the string has lost some tension since it has never been restrung.

I am planning to restring this racquet but i do not know which string is most suitable for me. Can you guys help me out?

Thanks