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Robust working 1:12 RC model of the 6x6 rocker-bogie mobility system used in Mars rovers Perseverance and Curiosity... Tons of play value. Works well over most neighborhood surfaces and terrains, but sometimes gets stuck in loose sand. What you put on top is up to you. NB: The NASA rovers are 6x6x4 platforms, with 6 wheels, all 6 driven, and the 4 corner wheels steered. At 1:12 scale, steering individual wheels with LEGO motors is out of the question. So this model is necessarily a 6x6x0 platform — but one with reasonably effective skid steering. Several years ago, made a pretty faithful working 1:12 model of Curiosity with more emphasis on visual realism than on mobility system performance. The current model vastly outperforms the old one... Purist alert: SBrick RC receiver, non-LEGO elastics used to suppress wheel spread.