... -4, FR-1, CEM-1, CEM-3, FR-4 Halogen Free, Aluminium ect.Layer1-32Board Thickness0.4mm-3.2mmCopper Thickness0.5oz ... width/space4/4mil(0.1/0.1mm)Surface FinishHASL, Lead free HASL, OSP, Gold-plating, Chemical silver, Chemical gold(ENIG), Chemical ... ,L/C or Western union high quality single layers lead free HASL pcb for electronic