About quantity: One box contains 12 pairs.36-41 size, can be mixed batch.For large orders, please consult customer service. Regarding express delivery: Small quantities will be sent via express, while large quantities will be shipped via logistics with freight collect.After purchasing the item, contact customer service to adjust the price difference. Regarding after-sales service: We do not provide returns or exchanges for non-quality issues. If there are quality issues, please contact customer service within 48 hours from the date of receipt to resolve them promptly The product price is excluding tax. Please contact customer service for details on adding tax points for invoicing