You cannot hand over the manufacturing of your printed circuit boards to an unknown company. All companies are not same in this industry. Always contact the best PCB manufacturers that will deliver on their promises. They have advanced manufacturing setup. The PCBs made by them meet the highest electronic standards as well as international laws related to the electronic items. Contact a company that has experience in this field. Check details of its manufacturing facility through other sources.
Top PCB manufacturers produce high quality PCBs that can be used in high value products. These PCBs last long and keep working as intended. Reliable manufacturers put the boards through various quality control processes. It ensures only the best PCBs come out of their manufacturing center. First determine your specific needs and then contact a company that can make that type of PCBs for you. You can order a few samples before placing the large volume order.