I have taken my Hoyt Protec to our local archery shop several times to see if my string - which is about a year and half old and has about two thousand shots through it - need replaced. The string is a Winner's Choice. They are indicating that these strings, particularly in bows that are set less than 70 lbs., will last a really long time and not to worry about it. I have no fraying to speak of and the string looks great. I'll probably do it sometime in 2008 anyway, just for peace of mind.