5.5"x 5.5"x 1/8" thick polycarbonate as pictured, tuff industrial plastic. 5 bucks
John in Eagle River by Fred Meyers 242-83two 4.
I also have larger sheets of plastic, cut offs and remnants. 20 bucks each o.b.o.
I will sell the lot for 200 bucks there are about a dozen pcs. Also a nice pc of sheet aluminum, 3 foot square and a 5 x5 sheet of 26 gage sheet steel , 20 bucks each.