... layers, FR4, Au. 2.Short Lead Lime. 3.UL,RoHS,SGS, ISO9001:2000 4.Approved HASL PCB; PCB Boards Capability Material: ... FR4, High TG FR4,Halogen Free material,CEM-3, Rogers HF material, etc. Layer counts: ... . drilling slot size: 0.6mm Solder mask color: green, black, blue, white, yellow, and matt, etc. Solder mask hardness: 6H Legend/Silkscreen Color: ...