Exchange: Replacement is allowed only within 30 days from the date of purchase: 1. Unopened or unused products: Products may be replaced without additional freight and handling charges. 2. Used products with non-quality problem: 30-50 shipping cost will be charged.. 3. Used products with quality problems: shipping costs for exchange will be borne by isinwheel. 4. The replacement will be made immediately on the second business day of receiving the package returned by the customer.