... , white, yellow, purple, and matt, TorTai will design, manufacture and assemble a complete PCB/Membrane Switch assembly to meet your needs. Our Manufacture Capability: Material FR4 ... 30mil Solder mask color green, black, blue, white, yellow, purple, and matt, Solder mask hardness 6H Heat resistance -200 to +300 ... 0 x 1011 OhmsAssembly:Different kinds of connector, screws, IC and LEDS are available PCB