... board, circuit board 2.PCB board and assembly 3.Certificate:ISO,UL 4.1 to 24 layer 5.Accept small order phone pcb board, circuit board ... :Specializing in Double Side PCB, 4-layer pcb, Multi-Layer ... Tg FR4, FR1, CEM-1, FR-4,etc. Board Thickness: 0.4-3.0 mmTreatment : Lead Free HASL, ... the best material for all our products. 4. We will send the boards to you by ...