Astro and dirt I imagine but at good angles, thats what all the Southport bumps and middle jump is made out of and they are holding up pretty well.
Did you get a chance to see what the Euro jumps were made with.. under the carpet?
I know on a few yank forums i've seen a link ponder around for making motocross jumps, not the same as our class but apparently if its scaled down it can be made in to a pretty useful guide.
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