A：a.We have being concentrating on the hardware industry for more than 10 years ,have rich experience and very mature technology. 

b.Our principle is that no products are allowed to be produced without confirmation of the samples and drawings,meanwhile the products will be monitored during the whole process,the production will be shut down to adjust and there is a final inspection of mixture to guarantee quality.The photos of the products and packing will be sent to you to confirm,so there is no doubt about the quality of our products.