The sample is solely offered for tryout, which is not free. After testing, you will need to either return it back or make the payment for the product and keep it.
To get a sample, you need to sign a sample application agreement (stating the products details and prices). Do note that for some products, you may need to place a deposit.
For the sample orders, shipping and delivery cost and additional charges in transit (e.g. tariff for customs clearance) should be borne by yourself.
The test period is 20 days from the receipt of goods. After 20 days, you can keep it if you are satisfied or return it back if it is not suitable, but kindly advise the feedback in time.