1.phone pcb board, circuit board 2.PCB board and assembly 3. ... ,UL 4.1 to 24 layer 5.Accept small order phone pcb board, circuit board :Specializing in Double Side PCB, 4 ... -4,etc. Board Thickness: 0.4-3.0 mmTreatment : Lead Free HASL, ENIG, Immersion Tin, Immersion Silver, OSP etc. Treatment Solder ...