4 layer pcb 1.4 layers board 2.Surface finishing: FL-HASL 3.Certificate: UL,Rohs,ISO9001,TS16949 4 layer pcbWe manufacture printed circuit board ... HASL, Immersion Gold,OSP, Edge commectors,etcProducts range:pcbs from 1-16 layersMin. line width/line space: 4milsMin. finished hole size ... : 0.2mmAdvantage: Good quality with reasonable price; quick deliver. 4 layer pcb