1. Changshun Industry and Trade Co., Ltd. is specialized in this line for 14 yeras. 2. Sample will be provided before make a delivery. 3. We will reply you for your inquiry in 24 hours. 4.OEM service shall be provided. 5. after sending, we will track the products for you once every two days, until you get the products. When you got the goods, test them, and give me a feedback.If you have any questions about the problem, contact with us, we will offer the solve way for you.