Each air struts produced by Maxload has a corresponding unique code. We can trace it back to the date of production and the operator through the code. Within 1 year from the date the product is sold to the user, we promise that there will be no defects in materials and workmanship under normal use. If you have any questions, you can contact us at any time. Even after the warranty period has expired, you can still make any inquiries about the product through the after-sales service hotline. In order to keep the air suspension system in service for the longest time, we sell all the parts of the product separately, even one bolt, even after a few years, you can buy the relevant parts of the product through after-sales, so that the product can be used throughout. Worry-free in life.