... Special holes size of 0.015mm Red solder mask 6 layers PCB board1. Special thickness of 1.0 mm2. Minimum track width ... 0.1mm3. Special hole size of 0.015mm4. Impendance ControlOur PCB capacity as below:Base material: FR4, FR1, FR2, Ceramics, Aluminum ... leveling, soft gold, hard gold, immersion gold, gold fingers. 6 layers Printed Circuit Board