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