... the circuit layer is made of PET (polyester)5) Key type: embossed key, poly dome, tactile6) Surface treatment: screen print, glossy ... choice4) Surface treatment: any color can be printed by any type printing ink as required, glossy, semi-glossy or matte finished5 ... membrane switches:1) Life Expectancy: 1,000,000 actuations per switch position2) Actuation Force: 6~24 ounces (170~680g), Range depending ...