Brand Name: strongtimes Number of Layers: 4 Base Material: FR-4 Copper Thickness: 3mil Board Thickness: 1.6mm Min. Hole Size: 4mil Min. Line Width: 3mil Min. Line Spacing: 3mil Surface Finishing: lead free hal Printed Circuit board, Single Side PCB, Double Side PCB, Multilayer PCB, Rigid Flexible PCB, Rigid PCB, Flexible PCB, Impedance PCB, HDI PCB, MCPCB, FPC, Aluminum PCB, PCB, PCBA StrongTimes Electronics Co., Ltd is a high and new technological company which specializing in manufacturing single-sided, double-sided and multilayer PCB of high precision, high density and high reliability.