This a set of 4 direct replacement gears for the main axel drive gear on Rivarossi F9 chassis.
This gear may also fit other O Scale locomotive chassis.
Please note this part does not come colored or painted.
This part has been designed for the Smooth Fine Detail materials so it will require cleaning before painting. I recommend washing with warm soapy water then soaking in 'Goo Gone' or a similar non-corrosive product for 24 hours. Then rinsing off with warm water and allowing to dry.
For more information please see my blog - www.jamestrainparts.com