... '' (550x640mm)Impedance control: ±10%Surface finish: OSP, HAL, HAL lead free, electronic gold, ENIG, gold finger, immersion silver, immersion tin, thick gold ... material: FR4 (Shengyi, KB, Intl.); High TG (TG150, TG170), Halogen free, Alum. ( ) Cu, Iron, ceramic base