kit of 8 replacement gears, made in 3D printing, for the Bachmann DD40AX N scale locomotive (1:160)." These high-quality gears are specially designed to solve wear problems and ensure your locomotive?s optimal and durable performance. Made in France, they are perfect for model railroad enthusiasts and collectors. First and second generation!! Made out of high resolution abs like resin for better detail and strength then counter parts that use pla I will default make these in White abs like resin but i do have blue/gray/black also if you message me. My father likes to color code his gears for his trains so want to offer this as well Gear dimensions: 15 teeth Outside Diameter: 6.8mm Shaft: 1.5 mm Thickness: 4mm, including shoulder Key Features: Compatibility : Bachmann DD40AX Locomotive, N Scale (1:160) 8 Gear Kit remanufactured to replace worn or damaged parts Brand New, designed for durable performance Brand : Petey Locomotive Workshop Year of Make : 2024 Warranty and tested : Each gear undergoes rigorous testing to ensure optimal functionality