Layer: 2 L Surface finish: Gold immersion Material and copper : FR4, 1 oz High quality, best ... space: 0.2mm4. Min Laser hole: 0.25mm5. Surface finishing: Gold immersion ServiceQuotation in 2 hoursQuick and economic delivery termFR4 Double ... finish: OSP, HAL, HAL lead free, electronic gold, ENIG, gold finger, immersion silver, immersion tin, thick gold platingBase material: FR4 (Shengyi, KB, Intl ...