Silicone keyboards with metal front plate
Silicone pads are made from highly elastic, toxin-free silicone rubber. They are created by moulding them from the basic materials that are fused together at a defined temperature and pressure. A special tool is necessary for each model. There is usually a conductive carbon pill for each key on the bottom side. The lower contact part is normally formed by meander-shaped conductors on a film or printed circuit board base.