This product is made of photosensitive resin, non-injection molded parts. This product are 3D printed products, some models need to be simple bonding. Will not be “will not be assembled, assembly difficulties” as the reason for the return! All products may exist in the store, manual processing, or sanding removal of support traces and other unavoidable circumstances. The products are packed in plastic bags, then wrapped with bubble plastic and cotton wadding, and then packed into reinforced and hardened cartons. The packaging is very safe. Please don’t open case or leave any bad feedback, we will do our best to resolve any problem. However, the speed of our international standard express transportation is still very fast! When you receive our item. If you are not satisfied with our items. I will give you the best solution.