Rivet Rex is a DIY robotic building kit that provides hours of play and learning. No batteries are required with Rivet Rex, it converts the sun's energy into usable electricity. Start the road to STEM discovery with Rivet-Rex and engage in fun play, challenging build plans, troubleshooting, problem solving, and solar power. Detailed instructions take you through each step and bring fun to life. After you’ve completed all 12 Rivet Rex robots, foster creativity with your own custom builds beyond the manual.