... :1~22 layersMaterials: FR-4, CEM-3, Teflon, Aluminum, Rogers, High TgSurface finished:Lead Free HASL,Immersion Gold/Tin/Silver, OSP ... .016"0.40mm7Max. Copper Thickness 4oz140μm8Max. Board Thickness 0.189"4.80 mm9Min Board Thickness2L0.008"0.20mm 4L0.016"0 ...