If you mean Worlds Best Strings...great choice...
If you call Allan ...Phone: 306-628-3992 he is a very knowledable person and knows most of the string lengths for most of more popular bows or knows how to find them...
simply give Allan a call and he will help you out...a great guy to talk too and hands down best strings I ever had on my bows...
http://worldsbeststrings.com/
Neil