Zipper Bait Bags were invented to be used primarily by trotline crabbers that use razor clams as crab bait. They can be used for other baits including but not limited to shrimp heads, chicken necks, Alewife (LY), eels or anything else you can think of. That is the beauty behind this technological innovation they just stay on your line and you can throw anything in them extremely fast. You can also unbait quickly when your done, no more bushel baskets of bait bags all over the place. These bait bags also have other uses as well and have been purchased by people from all over the country and abroad for various applications. They are slightly longer then 8" made out of a heavy duty plastic mesh material. The final choice was made in using the specific mesh material present in the final product because it catches crabs and has the strenght to hold up to the tough marine environment. All components constructed into Zipper Bait Bags are specific to this application nothing will rust or corrode. All metal is marine grade and meant to be used in salt water. These have been used heavily by commercial crabbers and are said to be outlasting standard bait bags that lack the zipper, because of the added strenght given to them by their zippers. All orders of Zipper Bait Bags come with small, orange zip ties for fast patches to increase their longevity.