All lengths are ACTUAL STRING LENGTH - *Not AMO Length or Bow Length* B-50 Dacron string material is easier on the bow limb tips with more stretch. Center & end loops served with #4 nylon serving. ** LENGTHS ARE ACTUAL STRING LENGTH IN INCHES ** HOW TO MEASURE FOR A NEW STRING Measure the bow string that you currently have and round up to the nearest full inch. B-50 Dacron strings will stretch a bit as they are broken in. If you DO NOT know the length of your bow string, or the string is missing, a good rule of thumb is that a longbow will take a string approximately 3" shorter than they are marked and a recurve bow generally takes a 4" shorter bow string. So, if your bow is a recurve and has marking such as AMO 60" or 60" AMO , a 56" actual length bow string should be the proper length. IF YOU ARE UNSURE TRY A INTERNET SEARCH, THERE IS LOTS OF GREAT INFORMATION AVAILABLE ON HOW TO PROPERLY MEASURE FOR THE CORRECT BOWSTRING ** LENGTHS ARE ACTUAL STRING LENGTH IN INCHES **