you can also use rubber digger tracks, these would be oval shaped when laid out and depending on the size of the machine they come off can be various "heights" as well. contact your local tyre man and see do they order them in for anyone (as they would be replacing the old ones) or your local hire firm that hire out mini diggers would be delighted to get rid of them and they are perfect, no putting them together or anything and because they are rubber need no maintenance and actually raise the temperature of the soil inside
perfect
good luck
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