VIDEO SURVEILLANCE Warning Sign with 3M Reflective Vinyl Coating "12x18" These signs are precision printed on high impact standard 0.64 gauge reflective aluminum The reflective 3M vinyl material provides maximum daytime and nightime visibility The high quality 3M engineering grade material prevents fading, yellowing, scratching and cracking 0.64 gauge reflective aluminum is weatherproof and will not rust 12x18" signs have have 2 predrilled mounting holes