Double-sided PCB Prototyping : 1) Material: FR-4; 2) Copper: 1 OZ; 3) Solder Mask Color: Green; 4) Surface Finishing: HASL. Double-sided FR ... -4 Green color PCB Prototyping Printed Circuit Board ... -sided PCB,Double-sided PCB,Multi-Layer PCBMaterial Type94VO,FR-4,CEM-1,CEM-3,Aluminum PCBLayer Count1 to 8 LayersMax ...