... packing and quick del FR-4, multi-layer pcb,Detailed technical requirements:layer:6material:FR4(SY)Board thickness: 1.0mmSurface ... Height of Idents25mil15Color of silk-screenWhite,Yellow,Black16Date file formatGERBER FILE and DRILLING FILE, PROTEL SERIES, PADS2000 SERIES, Powerpcb SERIES, ... via board,single board,double-sided board,multi-layer board.Hasl board,immersion gold,immersion silver,plating ...