Product Model: Intelligent Android Robot Mainboard PCB Base Material: Shengyi S1141 High-Performance Epoxy Glass Laminate Layer Structure: 6-Layer Multilayer PCB Solder Mask & Silkscreen: Blue Solder Mask with White Silkscreen Finished Board Thickness: 1.0 mm Copper Weight: Inner Layer 1 oz; Outer Layer 0.5 oz Surface Finish: Electroless Nickel Immersion Gold (ENIG) Minimum Design Rule: 3 mil (0.075 mm) Trace Width / 3 mil (0.075 mm) Trace Spacing Application: Main control board for intelligent Android robots