Generally speaking you'll almost always have problems with factory strings unless it's stated that the bow comes with Vapor Trail, WEinner's Choice, Stone Mt. or others on it. I can only state what I've read on a lot of forums, but Zebra's and Barracuda strings just don't have a very good reputation with most who know what they are talking about. You should be much better off with Stone Mt. I've only had dealings with ProStrings and Winner's Choice and they are both top notch.