This is a type of mixed PCB built on 10mil RO4003C substrate and FR-4 combined for the
application of SMS Gateway. It's 1.12 mm thick with 4 layers copper of 1oz weight each layer,
white silkscreen on blue solder mask and immersion silver on pads. The base material is from
Rogers Corp supplying single up PCB per panel. They're fabricated per IPC 6012 Class 2 using
supplied Gerber data. Each 25 boards are packed for shipment.