... its heavy element per batch by authority testing company, we can offer the test report to you depending on your requirement. ... silver, copper, black oxide, etc. 6). We can offer test report of heavy element for our product per batch to you depend ... bronze, Zinc alloy, aluminium and other material as requestedSurface treatmentkinds of plating (Zinc, Nikel, Chrome, Tin, Ag); Painting, Powder, Anodizing, ...