The best way would be to take it off your bow and measure it. You could also take a lead pencil and mark your cam next to the limb so that you have a reference to see if something is stretching. Go on the Hoyt website and see what your ATA and brace height are supposed to be. As far as good replacement strings , Winners Choice, Bucknasty, Vapor Trails. Those are the ones I could think of right away but there are others also.