Hi all, I recently found, yes found, some rackets that my dad had bought awhile back. They were Yonex Carbonex21, Carbonex15, and a Boron 2. I've tried out them, and I like the 21 more. I know the Boron 2 is a rare one, so I rather not want to play with it(it's still has the plastic wrapper at the end!). Anyways, to the question. Which type of strings would be good for the 21? BG 65? 66? 85? And what does the number stand for anyways? Also, how many pounds of tension would you suggest? I'm thinking about 20-22 Ibs. Thanks in advance.