What tension can I use?

[Kaylie]

I found two racquets, yonex bh-8100 and carbonex 18, I am wondering what tension can I use for them. I am still a beginner so I was wondering is 22lbs ok for those two rackets? As I can't find any information regarding those two.

 

[brentjohner]

Are the loops on these racquets graphite or aluminum? Our rule of thumb is graphite loops 22 lbs, aluminum loops 17 lbs.