What is the surface on boxes made of?

what is the surface on boxes made of? ive tried plexi glass and its not the best stuff. anyone know the real stuff they use on boxes at ski hills? and were i can get some.
 
^ hdpe, high density polyethelene i believe, there's a big plastics complany near me that sells it for 100 for a 4 foot by10 foot sheet, i made a box out of it and it worked great
 
i dont know if its the same stuff, but what about the material that cutting boards are made out of? i know its becoming more popular in offraoding for skid plates because its semi flexible and slides over rocks like butter. last summer i found a wholesaler that sold it it big sheets
 
If you go to a commercial sign shop, they typically will have some sort of junkyard, and if you find a bunch of leftover lexan, they usually will let you take the scraps. Its how I made my rainbow rail, just might take some piecing together.
 
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