3*3W Aluminium Substrate PCB 1.Diameter 51mm;thickness 1.6mm, 1oz 2.thermal ... 1.0w/mk 3.withstand voltage 1500v 3*3W Aluminium Substrate PCB1.Diameter 51mm;thickness 1.6mm, 1oz2.thermal conductivity 1 ... Height0.8mm20Letter Colorwhite, black, blue, yellow, red 3*3W Aluminium Substrate PCB