... Min Laser hole: 0.25mm5. Surface finishing: Gold immersion ServiceQuotation in 2 hoursQuick and economic delivery termFR4 ... : OSP, HAL, HAL lead free, electronic gold, ENIG, gold finger, immersion silver, immersion tin, thick gold platingBase material: FR4 (Shengyi, ... KB, Intl.); High TG (TG150, TG170), Halogen free, Alum. ( ) Cu, ...