Usen is a Professional manufacturer of PCB.We have 1000 employees. Specialized in 1-4 layer rigid boards PCB, also we can do Aluminum base PCB. We ensure the quality and delivery time. Surface finishing: LFHASL, OSP, Immersion Gold, Immersion Silver, Gold Plating, etc.At ISO 9001:2008 ISO 14001:2004 TS 16949:2009-certified facilities in our factory, everything we make is RoHS Directive-compliants.We monitor every step of production to ensure your expectations of quality are met.Competitive prices and comprehensive after sales service are provided as well.If you have any requires, do not hesitate to let us know.