The new Mars Mission sets have come out. The set I would want most would be the Crystal Reaper 7645. I have counted the treads and there are 70 of them in the new black color. And 6 orange sprockets like the ones in the bulldozer set. The price is 50 dollars. It contains 600 pieces. The below picture is not of the whole set. I have only seen it for sale in the UK. But that should change soon.
