... graphic overlay is made of PC (polycarbonate), and the circuit layer is made of PET (polyester)5) Key type: embossed key, poly dome, tactile6) ... mostly use PC (polycarbonate) or PVC material and the circuit layer commonly use PET (polyester) material2) Rear adhesive: 3M, Sony, ... Soken, or any tape you choose3) Key type: flat key or embossed key, tactile or non-tactile, poly dome or metal ...