... finish: HASL CE, UL, ROHS approved Specifications:1) Double layer PCB, 1.6MM2) Strict quality control3) Prompt delivery.3) Samples are ... , HAL, HAL lead free, electronic gold, ENIG, gold finger, immersion silver, immersion tin, thick gold platingBase material: FR4 (Shengyi, KB, Intl.); High TG ... , TG170), Halogen free, Alum. ( ) Cu, Iron, ceramic base Double sided PCB / multilayer PCB