... purchasing test, packing and quick del FR-4, multi-layer pcb,Detailed technical requirements:layer:6material:FR4(SY) ... 10um 12Soldermask Green,Yellow,Black,Blue,White,Red,transparent photosensitive,,soldermask,Strippable soldermask13Minimum linewidth of Idents4mil14Min Height ... Blind via board,bured via board,single board,double-sided board,multi-layer board.Hasl board,immersion gold,immersion ...