... Print circuit board1.Certificate:ISO90012. Good Quality: UL, SGS Test, RoHS Certification,3.1-12 layer:FR-4, Alu, ... 20/0.20mm0.10/0.10mm0.10/0.10mm Hole wall copper thickness / ≥20.0um≥25.4um Minimum annul ... silver/tin,Color Green ,yellow, blue ,red black and so on Materail FR-4,Aluminium-backed board,Halogen-free ... compatible,High Tg,High CTI,CEM-1,CEM-3 etc. Single Sided Printed Circuit Board with SMT