D-97 is a low stretch performace material that will add speed to your bow. However not all bows can with stand the forces put on them by these strings so make sure your bow is able to use a fastflight string. we mark all of our strings by the length of your bow so the string will actually measure 3 inches shorter than the length marked on your bow. If you have any questions or want to custom order a string call us (812)-276-5430 or email us timberhawkbows@gmail.com