... description.1) material: can be steel, brass, stainless steel, plastic, Aluminium…2) surface treatment:kinds of plating (Zinc, Nikel, Chrome, Tin ... , Ag); Painting, Powder, Anodizing, E-coating, Silkscreen, Heat treatment, Black oxid; 3) producing scope: cnc ,Laser cutting ,metal ... made packaging method according to customer's requirement sheet metal heat sink with black powder coated