LED Aluminum PCB Size: Diameter 20mm, Thickness 1.6mm Layers: Single / Gilded Application: use with single 3W RGB LED LED Aluminum PCBSize: Diameter 20mm, Thickness 1.6mmLayers: Single / GildedApplication: use with single 1W/3W power LEDFeatures: welding convenient, low thermal resistance, rapid speed for cooling. LED Aluminum PCB