So far, BG65 .... or if you want thinner gauge ... BG66 Really, really OLD FEEL ... look for GOSEN HY-SHEEP ...
The GOSEN HY-SHEEP reminds me to my primary school days. It was good on the aluminum Cab 8. On a total graphite racket it simply did not feel as good. At least on my first non t-joint racket (RSL 2000). I'm a fan of the carbonex series. I'm using cab 20 sp 3u, cab 20 ti power and just purchased a cab 8000 ti. My fav is cab 20 sp strung with Ashaway Microlegend @ 27lbs. Love the 'mettalic' feel from the string. Simply addictive. Previously it was strung with Ashaway Durakill 66 but it felt like my RSL 2000 with GOSEN HY-SHEEP.... numb and dead...
Just gossiping last night and I heard one HK shop is selling a carbonex 20 for HKD4000, roughly USD500....the racquet was supposedly used by Xia Xuan Ze. Hmmm...