Usually it should be several hundred, so my friend gave me one (silver ion craft cup, patented product: ZL00220384). 7) He got it directly from his friend (the second wholesaler), which is estimated to be several hundred. Anyway, the retail price in his friend's shop is over 1000. My answer is that there is a big difference between downstairs and downstairs. There are two reasons. One is that this industry may be as lucrative as the pharmaceutical industry. The other is that the model and batch number are different. Please refer to it yourself for details.