The graphic overlay is a polyester or polycarbonate foil. Most of the cases it is screen printed on the back by different colours, sometimes embossed and in case of matt foils at the transparent parts (for example display) it is vitrified or has a coloured transparent window. This foil has very good physical and chemical features.The graphic overlay can be a product itself! With or without adhesive foil. The membrane switch board can be determinated according to the following three components:The membrane switch board can be determinated according to the following three components: Graphic overlay, Base material, Connecting elements.