The HO Scale Drive Axle Gear (12) is specifically designed to fit Athearn Blue Box and Proto 2000 GP7, GP9, GP30, and SD40 models. Made of durable plastic, this gear set is compatible with HO gauge trains and is manufactured in the United States. The gears come in a vibrant blue color, making them easy to identify and replace on your model railroad. Perfect for hobbyists looking to maintain or upgrade their Athearn locomotives, this gear set is a reliable and high-quality part for model railroads.

These are 3-D printed gears that come in a cluster of 12. You will need to separate them and clean up the ends before you use them. I run these on my own locomotives.