1. Can I get some samples before place order and how long for a sample? Yes, and samples are always free, delivery time 3-7 working days. 2. Can you make the caps'surface flawless? Yes, we can. We have 30 years of experience in the production 3. Can we do printing or label printing on the glass bottles? Yes, we can. For eliquid bottle service, we can offer label printing, shrink wrap, box packing, display cardboard box. About printing Color: Color can be made according to PANTONE color Number if needed. 4. How do you control the quality? **We do leak test for 3 times before packing. **The ISO 9000 Qualified certification and ISO 9001:2000 international standard. **SGS test and TUV certificate, ISO8317. **Our Chemical bottles are disinfected in EO Sterilization.