What's the big market of medical devices in Yiwu? Is the quality guaranteed?

Yiwu medical device market has formed a market norm for the medical device industry; Professional evaluation and certification have been carried out for the products of enterprises that have settled in. If there are quality problems in the sales process, they will be paid first, and the enterprises with "problem products" will be blacklisted in the industry and cleared out of the big market. Don't worry about the purchasing unit! !