LAYER 4layer [FLEXIBLE 1layer + RIGID 3layer] 4-1 Application Industrial Equipment Thickness 0.5T Machine Drill Min. 0.25mm Laser Drill BVH Min. 0.12mm Cu Plating HOLE Min. 25 L/S 110/120 PSR / COV GREEN / YELLOW Surface Treatment ENIG Impedance LAYER 4L Impeance spec 50