factory direct sales 3.4,2.6 applicable pen can replace universal ink sac black blue red blue black ink ink sac 厂家直销3.4，2.6适配钢笔可替换通用墨囊黑色蓝色红蓝黑墨水墨囊

Small business operation, low profit margin, if the sold products have damage, please take photos and contact customer service for after-sales processing. Our store does not support returns for any reason such as poor quality or unsellable. Our products are not crafts, and those who pursue perfect quality should be cautious when placing an order. Please note that the 7-day no-reason return policy is only applicable to individual customers who purchase one product. Multiple wholesale and custom sales customers do not support a 7-day no-reason return policy. If you have any questions, you can contact the manager's WeChat to discuss the handling. Thank you for your cooperation. For invoices and custom orders, please contact the manager's WeChat.