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Start your engineer on their road to discovery with Rivet Rex12 Introduce them to challenging build plans troubleshooting and problem solving and solar power Build and rebuild over and over again Detailed instructions take you through each step Your Rivet Rex 12 kit contains unique components parts to construct hydro mechanical robots that operate like animals After assembling a model the user can easily reassembly components into a different model These robots are powered by direct sunlight NO BATTERIES REQUIRED Once you have completed all 12 model builds use your creativity and try your own constructions.