These cases are destined for special uses because they are developed to resist to shocks, water, corrosives, dust and environmental circumstances. Made out of a heat-shaped polyethylene copolymer which makes them extremely resistant to shocks. One of the most important characteristics is the complete resistance to water (they even float), guaranteed by the neoprene packing, the manual pressure valve, high resistance to chemicals and the possibility to adopt special safety locks. Internally they can be equipped with a special pre-formed polyethylene foam, with a one square centimetre cube-matrix, which can be formed around the objects it contains. The cases are all equipped with metal internal supports, for the placement of small panels or boxes for fixing the content.