Heavy Duty RC offers a selection of upgraded parts for Huina toys. Please note that these upgraded parts are not manufactured by the Huina factory. We work closely with a custom metal fabrication and electronic company to design, manufacture, and deliver these upgrades to customers worldwide. Our upgraded parts are designed to enhance the performance and durability of your Huina RC toys. Each upgrade part has been rigorously tested to ensure that it meets our high standards for quality and performance. If you have any questions or concerns about our upgraded parts, please don't hesitate to contact us at firstname.lastname@example.org. Our knowledgeable customer service team is always happy to assist you.