... mm Special holes size of 0.015mm Red solder mask 6 layers PCB board1. Special thickness of 1.0 mm2. Minimum ... : FR4, FR1, FR2, Ceramics, Aluminum, Rogers, F4B, F4BK, F4BT, TP, PF, CEM-1, CEM-3, etc. Board thickness: 0.30 to ... air leveling, soft gold, hard gold, immersion gold, gold fingers. 6 layers Printed Circuit Board