... pcb circuit boards structureTop silkscreen/LegendTop Surface finishingTop Soldermask (overlay)Top TraceSubstrate/Core materialPrereg (PP)Middle Layers(Inner1.2.3.4 ... you.application fieldMedical, entertainment, military aerospace, interior design, real estate development, industrial simulation, emergency response, heritage,VR games,VR glass, web3D, road ...