Comes as shown on a roll. 50 feet long, the poly tubing is 3 mils thick and 3" wide when flat. That means that it expands to a maximum diameter of approximately 1.9 inches when open. You can cut off any length you want and heat seal it with an impulse sealer if desired (I show an example of this in the photos). It is amine free and is FDA compliant LDPE (low density polyethylene).