Tamiya 89916 - 4-Speed Crank Axle Gearbox(Clear) 田宮STEM系列齒輪箱組合 雙星孖星  [89916]

- Comes in a transparent case allowing you to see the inner workings of these gearboxes.
- Items 89914, 89915, and 89916 come with colorful green and gray gears.