1. Polycarbonate Polycarbonate is the strongest transparent material available. It will not crack, split, shatter or yellow with age and enhances the artwork UV stability. 2. Artwork All artwork is printed and encapsulated with our special process which makes it UV stable and 100% water-proof. There are no limits to the number of colours available. 3. Foamex Foamex is fire resistant and tough, it is available in many attractive colours. 4. Aluminium 3mm Aluminium for extra strength and rigidity. It can be powder-coated to any colour of your choice.