Ec-Firstclass is a transportation method rather than a transportation company, it provides forwarding services. Because if the parcels are directly shipped from China to the United States through the postal service, Federal Express, etc., it will incur high costs, so some Chinese e-commerce companies often use Ec-Firstclass to deliver goods to save costs. Companies like Ec-Firstclass usually cooperate with American shipping companies. After the goods arrive in the United States and undergo customs clearance, they will be handed over to the U.S. Postal Service for processing. So for those customers who don't know Ec-Firstclass very well, you can rest assured that it is completely legal.