This is a 4-layer printed circuit board. The PCB is well-equipped for high performance. It is made of quality material for added durability. 

• Material: FR4.
• Thickness: 1.6mm. 
• Layer: 4. 
• Copper thickness: 1oz. 
• Solder mask: green.
• Silkscreen: white.
• Surface finish: ENIG, 2-5u".
• Peelable mask: none.
• Impedance control.
• X-out: none.
• Press fit: none.
• Via in pad.