Material-----The Dipai products are made of brass with high quality  .Electroplate --- The Dipai products must through pickle, copper plating, nickel plating, polishing, and then chromium nickel plating. Plate chromium liquid chemical material all adopt the import raw materials. It is less in above 25 micron for thickness to reach, and every trough products undergo acid destruction testing more than 96 hours. The salt fog testing for more than 200 hours, is far higher than the international standardPolish----The Dipai products are from rough to process to polish, there are a lot of processes, the polishing is seven, more than eight degrees. We check in strictly, reaches 36 processes. Each process wants 100% to examine by staff, quality examine person who examine 100% by herself, examine executive to inspect by random samples. So our products all details are perfect.Copper tube--  Dipai copper tube is in charge of in 1.0mm at least More than 5 mm. The thickness differs by more than one again, so Dipai products feel specially sink