This little gearshift assembly is able to shift just like a real
car gearbox with articulation. Its spring loaded mechanism is able
to create the special feel of a notched shift found in racing cars.
All metal parts with rubberised sleeve.
23mm (0.9") in diameter and 45mm (1.8") in height (excluding chain)

https://www.youtube.com/watch?v=ywXd6HoIJRc