... specifications about TT-MS-366: Material: Autotype EBG18 with 3 colors printing, need print the condictive silver ... layer is 0.125mm PET with 1.00 mm pitch; Super thin leds with flat clear windows.Rear adhesive: ... membrane switches with other special requirements, such as water-resistant, shielding, windows/lens coating, embedded LEDs, UV glossy ... typical Poly dome tactile membrane switch with thin leds