led assembly 1.PCB experience 12 years 2.PCB certificate:ISO,UL and ROHS 3.PCB Lead time:3-7 working day Shenzhen ... ZBX Circuit Board Co.,Ltd(we focus on quick-turn prototype and mass production for 1-30 layer boards) led ... , Plating gold20MaterialsFR4,H-TG,Teflon,Rogers,Ceramics,Aluminium, Copper base led assembly