Last set of take-offs I have before the winter break; purchased three weeks ago for $500 from John Burget; they were very lightly used when I got them; put 6 heat cycles in them last weekend; I can't measure depth but I hope you can see that there is quite a bit of life left; hope someone can use them for a couple of events before the winter....at least up here. I will take $200 to get them a new home. Pick up only in Southeast PA/NJ area