How can I make sure the mass goods quality?

Normally our other customers will order pre-production samples before the mass goods. After you approve the pre-production samples, we will produce according to the pre-production samples. During the production process, we will have internal QC to check the raw materials/printing color/surface treatment/product structure/packaging. After the completion of production, you can arrange a third-party inspection company to inspect the goods to ensure that the quality of the mass goods is consistent with the pre-production sample you have approved.