3W Aluminum PCB for LED 1.al base 1.6mm,copper ... .thermal conductivity 1.5w/mk 3.diameter:30mm 4 HASL 3W Aluminum PCB for LED1.al base 1.6mm,copper 1oz2 ... .15mm19The Minimum Letter Height0.8mm20Letter Colorwhite, black, blue, yellow, red 3W Aluminum PCB for LED