Shell casting aluminium alloy, with very low copper content, extremely robust. The body is painted by performing a double pass in-line process, which allows you to generate a single thick protective layer which then generates barrier against atmospheric agents and UV rays. Die-cast head made of aluminium alloy with very low copper content, which is subjected to galvanic anodizing treatment divided into distinct phases: mechanical satin finishing, surface degreasing, anodic oxidation and finally fixing. Subsequently the product is painted following the same processes that are applied to the body. This, in addition to the previous anodization, allows to achieve corrosion resistance performance in salt spray. PMMA diffuser. Pre-treatment with atmospheric pressure plasma is carried out on the surface before gluing of the diffuser on products.