The answer to your question exists multiple times in the thread. Try out the Search tool before asking very simple questions.
I don't mean to derail the thread in any way; however, we finally saw a Betrayer drop last night. I've been wanting to try frost for some time, and I feel I now have the gear to support a strike-heavy frost rotation. It seems that there are several different rotations that people are having some success with. I was wondering what your feelings were on them and if there is a "superior" frost rotation that I could begin to test with. Any help would be very much appreciated.