Coverups were developed to protect a wide variety of evidence at crime scenes, such as handguns, knives, shell casings, etc., from being rained on, snowed on, stepped on, moved or picked up by unauthorized personnel. Coverups are made of a clear plastic material, which allows you to see the evidence without having to remove the Coverup. They won't blow away in the wind because they come with 4 adhesive strips that will stick to almost any dry surface, from sidewalks to carpets, 4 barbed tabs that lock onto grass, and 4 holes which allow you to secure Coverups on dirt, sand, mud or snow by using 4” to 6” nails. Label on top for numbering and identifying evidence. Each measures 11 1/2” wide x 3 3/4” high. 20/case.