https://www.pcbapeak.com/product/4-layers-enig-1u-conductive-via-fill-pofv-green-pcb/
4 layers ENIG 1u Conductive Via Fill (POFV) Green PCB
PCB Type : Regular Multilayer PCB Number of Layers : 4 Layers (Max 64 Layers) Finished Thickness : 1.2 mm (Max 8mm) Base Material : FR4 TG135 Copper Thickness...
via filllayersenigconductivepofv