... black, blue, 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, High TG FR4 Layer counts 2-28 layers ... Solder mask color green, black, blue, white, yellow, purple, and matt, Solder mask hardness 6H Heat resistance -200 to +300 ...