... : UL, ISO, TS16949 3) T/T, Western Union, Flex-Rigid PCB Board with 4 LayerManufacturer Specifications: * Layer: 4 layer * Base Material: PI ... great PCBs and full details, we will reply to you with prices in one working day! - OEM services provided - Certificate: ROHS ... , UL, ISO9001-2000, ISO14001 - Factory direct price Flex-Rigid PCB Board with 4 Layer