Check the listing for details. NASA Future Explorers - Mars Rover Build & Model STEM Powerful Motor Robotic Arm. Color: Multi, Condition: New. Listed at 38.99 USD. The NASA Future Explorers Mars Rover Build & Model is a captivating STEM toy that allows children to build and customize a real working Mars Rover model with a movable robotic arm. This unassembled kit includes powerful DC motors capable of driving uphill and crossing uneven surfaces, making it an exciting representation of space exploration. The set also comes with an educational and instructional book that unveils the wonders of STEM education through electrical connections and mobility systems transmission systems torque. With a NASA franchise theme and multi-color plastic construction, this Future Explorer toy fosters curiosity and understanding in robotics, engineering, and space exploration, making it a perfect gift for children aged 8-11 years.