... finger finshed bule board. 2. good quality, fast delivery time. 3. good sales and technical services. 4 layer HASL+ gold ... supply, assembly services offer.1-12 layer PCB board,1-2 layer Aluminum base PCB1/3oz- 4oz ... copper thickness PCB board,CEM-1,CEM-3, FR4, FR4 High TG, ... High CTI, PTFE, Ceramics, Aluminum based etc. 4 layer HASL+ gold finger finshed High CTI ...