Product Model: Rogers 4003 substrate Dielectric Constant: 3.38 Stack Structure: 4003+4450F Core Thickness: 0.508mm (20mil) Finished Thickness: 2.0mm Base Copper Thickness: 17μm Finished Copper Weight: 1OZ Surface Treatment: Immersion Gold Solder Mask Color: Green / White Minimum Trace / Spacing: 6mil / 6mil Core Features: Rogers high-frequency PCB, Tg 280℃ high temperature resistance