... and the circuit layer is made of PET (polyester)5) Key type: embossed key, poly dome, tactile6) Surface treatment: screen print, ... (polycarbonate) or PVC material and the circuit layer commonly use PET (polyester) material2) Rear adhesive: 3M, Sony, Soken, or any ... ) Key type: flat key or embossed key, tactile or non-tactile, poly dome or metal dome for your choice4) Surface treatment: any color can ...