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Amazon.com: 80mm High Hardness Plastic Mecanum Wheel Omni-Directional Smart Robot Car Tire with Cross Type Hubs Compatible with Lego Blocks DIY STEM Toy(2 Left 2 Right) (4, 80mm) : Toys & Games
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Mecanum Wheels - Page 2 - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
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