1. multi-layer PCB 2.OEM/ODM 3. Certificated by ISO, SGS, UKAS, ... 4.on time delivery 5. good after - sale service 1) Layer: 1-402) Board finished thickness: 0.21mm-7.0mm3) Material ... ,Yellow,Blue or others4) Characters: White(default) or others5) Surface technique: Tin soldering, plating gold, immersion gold,OSP Multi-layer PCB