... copper) thickness: 0.5, 1 or 2Adhesive: 3mLayer: 4 layerStiffener: mylar or kapton and acrylicMinimum trace width: 0 ... 1Surface FinishHASL,Immersion Gold,Flash Gold,Gold Plating,OSP,Immersion Tin etc.2Layers2-30 layers3Minimum Line width3mil4Minimum ... ,FPC,rigid board,flex board,rigid-flex board,Blind via board,bured via board,single board,double-sided board,multi-layer board.Hasl board,immersion gold, ...