Pack of 250. These Steam Pan Liners are made out of high density polyethylene these liners are perfect for use in pans when dealing with difficult to clean foods such as: cheese sauces, fudge and caramel sauces, gravies, etc. They are also freezer to steam table, slow cooker, or microwave safe. These liners are intended for single use, allow you to skip all of the scrubbing and scouring, and simply twist tie leftovers to be preserved or thrown out.