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4WD Research Robot Chassis Kit - Rough Terrain – BotKits.com
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Trilobot Base Kit
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Mobile Platforms : Mobile Platform Kit 4WD for Arduino Robotics ...
Recon Chassis Kit - ServoCity
Professional Robot Kits by SuperDroid Robots
Prowler™ Robot Kit Chassis - ServoCity
4WD Utility Platform Kit- Single Layer | Makerfabs
2WD Mini Robot Platform Kit - RobotShop
DFRobot dfrobot devastator tank mobile robot platform (metal dc gear motor)