Robotbanao DC BO Motor Dual Shaft Smart Plastic Car Robot Gear for Arduino with Wheel, 2 pc Electronic Components Electronic Hobby Kit

Cost-effectiveness of the injection-molding process. Elimination of machining operations. Low density: lightweight, low inertia. Capability to absorb shock and vibration as a result of elastic compliance. Ability to operate with minimum or no lubrication, due to inherent lubricity. Corrosion-resistance; elimination of plating, or protective coatings. Tolerances are often less critical than for metal gears, due in part to their greater resilience.