When you receive your package, please be sure to check the product, and if there is a defect in the product, please contact us. Please contact us using the inquiry form as we will repair, refund, or exchange with a similar product. If you wish to repair a used product after purchasing, please contact us using the "Repair Inquiry" section of the "Inquiry Form". After confirming whether the item can be repaired, we will proceed with the repair if possible. We cannot accept exchanges due to customer convenience.