- 4PC Pinion Gear Set: Designed with precision featuring 0.9 teeth and a 1mm outer diameter, providing optimal performance for your RC quadcopter needs. - Compatibility: Specifically engineered to fit models 3mm X5C, X5A, and X5, ensuring seamless integration into your existing setup. - Essential Aircraft Accessory: This pinion is a vital component for the 720 coreless electronic starter, enhancing the functionality and efficiency of your aircraft. - Compact Design: Its small size makes it ideal for lightweight RC quadcopter rotor systems, allowing for increased agility and control in flight. - Durable Construction: Made from reliable materials, this pinion gear is designed to withstand the demands of high-performance RC usage. - Use Cases: - Perfect for upgrading your X5 series quadcopter, improving overall flight performance and reliability. - A great choice for replacing worn-out gears in your 720 coreless electronic starter, ensuring consistent start-up functionality. - Ideal for hobbyists looking to enhance the precision and responsiveness of their small RC aircraft. Choose this 4PC pinion for a dependable, compatible solution that enhances your RC quadcopter experience.