Hi,friend, Have a nice day Glad to know you're on the market for the pcb ,we are manufactory over 15years, specializing in this field with good quality and pretty competitive price.We produce PCB 1-12 layers. Line width/space: 3mil External copper: 7Oz Good quality comply with UL, RoHS and ISO 9001:2000 and SGS More details,call me,let's talk. Best regards/ Jasen Li Nature Precision Electronics LTD jasen(at)naturepcb.com