Since the provided filters are offered as gifts, they do not qualify for the warranty terms applicable to full-priced products. Kindly ensure a thorough review of your order within a week of product receipt, verifying the quantity, product type and product condition for eligibility in our after sales service. If you receive damaged, used, or incorrect quantity filters, please contact us at aplus@aroeve.com within 7 days receipt. Note: we are not responsible for any delivery or products problem resulting from incorrect address or model information provided.