Brand new piston with pins. Our **includes the replacement of the defective or worn-out product with the same product. The **does not cover any alteration, modification, damaged from neglect, accident, improper installation or misused of the unit. It also does not include reimbursement for any cost involving the labor, installation or re-installation of the auto part. Warranty validation: The products offered by aec (auto engine components) must be installed by a certified professional automotive mechanic. The **will be valid after the department of automotive engineers of aec (auto engine components) analyze the cause. The **will be valid after the customer presents the certificate as automotive mechanic professional.