It is really dependent upon how much you should and how well you take care of them. I usually replace mine every 2 years and I am usually slinging arrows 4-5 times a weeks and all winter in my shop. I believe Jimbows deals with Vapor Trails and Accurate Archery deals with World's Best. I have used both and prefer Vapor Trails. 60x are supposed to be fairly good and I think most shops will install any strings you order online for a setup fee.
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