Blue coated Aluminum, when lasered, Lasers to Silver. (12" x 24" x 0.020"), not suitable for outdoors use.
Laser Raster Settings:
-35 watt, DPI 400 Speed 70%, Power 60%
-60 watt, DPI 400, Speed 75%, Power 40%
The recommended setting above may need adjustments for best reults. Setting will vary depending on the Brand of Laser, Wattage of Laser Tube and Model of Laser Engraver.