led pcb board 1.Aluminum material; 2.Good quality with E-test ; 3. Certificate: UL, ISO,TS16949; 4. T/T,Western Union,Paypal round led pcb board with E-test 1 ... . Engineers team who tell you how to design PCB files to save cost. Price for prototype2 layers, 4" * 5" * 100 pcs USD ... , testing, and shipping to your door all included. Price for 100pcs above 2Layers board: USD 90/ Sq.meter (USD 0.057/ Sq ...