Cancellation for your convenience cannot be accepted. If you have a bad product, please contact us as soon as you arrive. Returns and exchanges are limited to those that are initially defective in principle. Please note that used products and products after processing by other companies are not eligible. Please be sure to call or contact us within 7 days after the product arrives. Please note that we cannot accept the above and after 8 days after the product arrives. We will bear the shipping cost if it falls into an initial defective product.