Product Model: Rogers RO4350B Hybrid Dielectric PCB Dielectric Constant (Dk): 3.48 Stack-Up Structure: 2-layer Rogers RO4350B + 2-layer FR4 composite structure Layer Count: 4-layer printed circuit board Finished Board Thickness: 1.0 mm Dielectric Thickness: 0.508 mm Base Copper Foil: ½ oz (18 μm) HH/HH Finished Copper Weight: 1 / 0.5 / 0.5 / 1 oz Surface Finish: Electroless Nickel Immersion Gold (ENIG) Application: RF circuit boards for communication equipment