1high power aluminum led light circuit boards pcb 2.al: 1.6MM copper foil 1oz ... free) NO. ITEM INDEX 01Surface treatmentHAL(lead free), Immersion Gold, OSP02LayerSingle-sided, double-sided, multilayer and special structure layer03Max ... black, blue, yellow, red1high power aluminum led light circuit boards pcb2.aluminum base: 0.8-3.0MM(1100,3003,5052 ... 3.0w/mk4.osp,HASL(Pb free), immersion gold,flash gold