I do believe that it is 1.5 mil thickness that I was given.

skaliwag- lol. I guess I should say it better. The rolls are 25" long, and looking from the end of the roll, the diameter of the rolls is 3 1/2" and teh tube it is on is just under an inch.

Would someone here be able to tell me the diameter of a full 500 ft roll so I have an idea of how much I got here. Got many uses for the stuff.