Single-sided Alu PCB Circuit BoardKey Specifications/Special Features: We specialized in 1-20 layers rigid PCB,Flexible PCB,PCBA assemly,Aluminum LED board.Aluminum PCB with Immersion Gold Finish, RoHS Compliance Material: aluminumWith immersion gold finishMajor material: FR-4, Nelco, HTG>170, high CTI value and halogen freeMinimum board..