Model train enthusiasts, this one's for your rolling stock! This is an Athearn HO scale roller bearing truck set. It's brand new, with the manufacturer part number ATH90386 and UPC 797534903869. The set includes two trucks, and together they have a total of 36 wheels, which is perfect for creating realistic freight cars or updating older models. HO scale means it's 1:87 size, the super popular scale for detailed model railroads. Whether you're building a kit from scratch, doing a repair, or just want to upgrade some of your existing cars with better-rolling trucks, this Athearn set is a trusted choice. They're known for good quality, and these should roll nice and smooth on your layout. A simple but essential component for keeping your model trains running right.