The rear boot strut comes with a sturdy replacement spring. This spring boot is designed for durability, ensuring your car's gas struts maintain optimal performance for a long time. For Model Y Austin Modified Automatic Lift Closer Waterproof Auto Power Front Trunk Electric Front Gate Say goodbye to manual operation and experience the convenience of an electric tailgate. Controlled and Safe Lifting: The gas struts allow for slow and controlled raising and lowering of objects, providing users with excellent control and safety during operation. In the unlikely event of a malfunction, please contact us and we will promptly send you a replacement. We strive to ensure our customers are satisfied with our parts and service.