6" x 40" x 20' these are very hard to find They are extra from a project, all have greay/silver on one side they can span 10 to 15 feet, can be used to make tiny houses, home or shop roofs, and walls, also can be used as a floor provided you put non slip flooring on top.
Very good insolation can make cool rooms, freezer, refrigerator room, celler, or heated rooms. A
$280 each. Or $4000 for all 16