After knowing the exact order quantity with exact product specifications, we are responsible to make every item correctly. If anything goes wrong, for example, damages or lost during shipping, just contact your sales representatives, any defective product can be returned and exchanged. In the meanwhile, we will also follow up the whole transactions to make sure you get the right and good products from us. No matter when you contact our customer service representatives, we will offer you the most professional advice in a timely manner, it is an essential part for us to be trusted by our clients as we have excellent customer service.