This ones very easy. It's a Mathews, so it has a zebra string, which means it will stretch farther than John Kerry telling the truth...and that's quit far. They're notorious for it...all that's required is for you to constantly twist it to bring it back into specs until you decide to put a new non stretch string on it...like Prostring, winnerschoice, stone mountain, etc. They're all high quality strings that are handmade, as apposed to the zebra which is factory built and comes with very little attention to detail.