Our WARRANTY is a 12 month no creep/serving separation warranty on BCY X99 and 454. If there are any issues I will quickly replace or reserve any affected string/cable but we will need it shipped back to inspect it. We try our best to avoid any mistakes, but if there are any I am happy to replace and/or fix the issue immediately. I just ask that you return the string/cable with the original receipt/order number from the website for replacement. BCY Dynaflight 97/8125/8190f el cheapo sets do not have a warranty.