Specifications include, but are not limited to: Manufactured Signs shall be defined as any sign manufactured in accordance with these specifications. These signs are regulatory, warning, guide, and information signs composed of a flat aluminum sheet, or an extruded aluminum panel surfaced with retroreflective sheeting and the message either directly applied, screened, or digitally printed on the sign face, all in the colors specified on the designs Aluminum alloy sign blanks for highway signs shall comply with the requirements of ASTM B 209, alloy designation 5052-H38 for 0.080 inch and thinner material and 6061-T6 or 5052-H38 for 0.100 inch and thicker material which can be found at https://www.astm.org/Standards/B209.htm Sign blanks shall be of thickness, size and shape shown on the purchase order and/or plans.