... with Aspect Ratio of 18:1 and Immersion Gold Surface Treatment TorTai will design, manufacture and assemble a complete PCB/Membrane Switch ... : 30mil Solder mask color green, black, blue, white, yellow, purple, and matt, Solder mask hardness 6H Heat resistance -200 to +300 ... Surface resistivity 1.0 x 1011 OhmsAssembly:Different kinds of connector, screws, IC and LEDS are available PCBA