Box surface material

So I’ve been learning to weld this year and kinda want to build some backyard rails and boxes. What kind of plastic is used on the surface of boxes? Is it pvc or some other kind of plastic?
 
HDPE. But you could do a bunch of skinny pvc pipes next to each other if you want a cheaper option

**This post was edited on Nov 18th 2021 at 7:59:54pm
 
not sure if theres better stuff but I used a hockey shooting pad and cut it up in sections. works good for me but theres probably better stuff out there
 
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