The foam is from an old broadhead target.
I usually hang about a dozen or so, but since my boys are hunting two legged deer now, I guess I could get by with less.
Yeah, I know what you mean about the 20yr thing. I bought two of them. had one stolen years ago and the other, I left in a tree after the season went out and I think It got water in the tubing and froze and split the verticle tubing.
One feature I like is the ability to fold the platform up against the tree. makes it easier to hide. Also I like the higher seat highth. 18" on mine. thanks for the comments. Don