PCB factory in Shenzhen city More than 12 years history factory with production ... of 100K sqm per year. We are PCB factory in Shenzhen city, our products specifications as below:Base material: FR4, ... 3.20mm (12 to 26mil) Copper thickness: 0.50 to 5 ounce Solder mask: LPI solder mask, conventional solder mask, ... leveling, soft gold, hard gold, immersion gold, gold fingers. Shenzhen PCB factory