Membrane / Machine Keypads
Membrane Keypads are made from printed foils of thin materials, usually polyester plastic. Top layer would contain the graphics and all the other layers below contain a flexible switch circuit. These usually have a tail leading away from the back that would fit through your front panel and plug into your PCB. There is a wide range of variations within the above, such as number of colours, clear or diffused windows, clicky or non clicky buttons.