High quality powder coated .040 thickness aluminum to prevent rusting. Digitally printed vinyl for numerous design options. Four color process, eco-friendly, weather, fade and abrasion resistant UV ink. Suitable for indoor or outdoor use with an average life expectancy is 10+ years. Two sizes available with a Caution Yellow Background: 6" x 6" (Diamond) and 12" x 12" (Diamond). One size available with a White Background: 12" x 9" (Rectangle). Please note that the signs does not included mounting holes. You have the option to request predrilled holes for extra $1.00. The 6" x 6" sign is also offered premounted to a 2' aluminum stake.