... finish: HASL CE, UL, ROHS approved Specifications: 1) Double layer PCB, 1.6MM2) Strict quality control3) Prompt delivery.3) Samples ... 4 mil (0.076-0.10mm)Max. board size: single, double sided 22'' x43'' (550x1100mm) multilayer 22'' x25'' (550x640mm) ... OSP, HAL, HAL lead free, electronic gold, ENIG, gold finger, immersion silver, immersion tin, thick gold platingBase material: FR4 (Shengyi, KB, Intl ...