led pcb 1.6 layers rigid-flex pcb board, 2.PI+FR4 3.3.5/3.5mil line width/spacing, 4.0.25mm hole, led pcb Part:SP508EMaterial:PI+FR4 Layers: 6L, rigid+flexLine width/spacing:3.5/3.5milSurface finish:Immerison gold Finished board thickness: 47+/-5milApplication: MP3Utilizing the latest technology, we have the ability to offer our customers the best quality pcb assembly led pcb