Material and construction Made with metal and crafted with fine workmanship, this single speed gear set features precise sizing for reliable performance. Specifications Material: metal Finish: silver Size: approximately 6 x 8 x 3 cm Compatibility: suitable for various electric rechargeable speed trains Easy installation Precise dimensions and thoughtful design enable straightforward installation with no Hassle, supporting smooth and efficient operation Key benefits Durable and longlasting performance with accurate gear engagement Consistent single speed operation for dependable driving feel Readytofit size that reduces setup time and fit issues Use scenarios Replacing a worn or damaged gear on a compatible electric rechargeable speed train to restore smooth operation Upgrading an existing model to maintain reliable single speed performance during regular runs Keeping as a spare part in a maintenance kit for quick field swaps on compatible trains