... Model Number Tablet PC Aluminium Alloy Back Covers Description Tablet PC Aluminium Alloy Back CoversMaterialAl.Specifications Depends ... copper etc.Process: cutting, stamping, perforating, bending, welding, plating, pad/screen printing, assembling Equipment: tonnage ... machine, bend presses, plate cutting machine, welding machine, wire cutting machine etc. Surface treatment: painting, anodizing ...