Is the rubber (NBR)o-ring mold made well in China?

Oh, there are many manufacturers that operate very well, but it is difficult to find them online, because the general rubber mold factory is not very large and formal. Generally, there are only six or seven CNC machine tools and some supporting equipment at most, mainly depending on how the dimensional tolerance is done, and the mold material should not be too bad. And the clamping line should be as small as possible. Of course, mold matching is also a problem. Here is a friend who makes rubber molds. If it is convenient, I can give it to you in Pingshan, Shenzhen.