Then you choose solid, push-pull type, because if the general interface is hollow, there will be 18K gold in it, but the merchant will not tell you when you buy it. In that case, a bracelet costs as little as 300 to 500 yuan and as much as nearly 1,000 yuan, so it is more cost-effective to buy a solid bracelet without welded joints than a hollow one. Because I am an expert, I still know this tricky thing.