Sierra Proto Express is an ISO-9001:2000 and MilSpec MIL-P-55110 certified, Silicon Valley based, high technology printed circuit board manufacturer. We specialize in fine line flex and rigid flex for the medical industry. In our 65,000 square foot facility in Sunnyvale, CA, we focus on quick turn prototypes and medium production. We also have a wide variety of capability including Thermount multi-layers, Metal Core PCBs, carbon paste, and boards with blind/buried vias, filled vias and micro vias and fine lines down to 1.25 mils trace and space. As a full service provider, we provide PCB layout and assembly services as well.