1. About Quality: We are very strict on QC for each order. Besides IQC, every finished product should be in two times defective inspections before entering the warehouse for shipping. To make sure each one you got is the right one. 2. About Customization/OEM/ODM: We have 8 years of OEM, ODM experience to serve different customers and help enlarge their brand in the market. white label service includes mouthpiece design, logo print or laser, your packaging design, or any we can do for you at our side. 3. About Shipping DHL, Though the vape mail ban is a problem for shipping, but we still have our way to take care of your shipping,like by sea,by air or by truck at local. We provide a door-to-door service. You will see that you'll get the vape stuff while you're counting your money at the office. 4. About aftersale service: We care about each order from your side and hope a long-term win-win business. So if any product issues, we will do a free replacement for you, or we can make some spare parts when we make the deal.