Are samples free?

Due to the high price of the product, in principle, it is necessary to pay for the sample, and express delivery; I can apply to borrow a sample for your reference or test. If the product is satisfactory and can be used, then place an order to buy, if the quantity is not large, this A set of samples will be added to the contract, and if you buy more than 200 sets of the following order, it will be sent to you for free. If the sample does not meet your requirements, then you can return it to us.