The MTH 30-70148 Denver & Rio Grande Airslide Hopper 3 Pack is a set of pre-built model hopper cars in O gauge scale. Made of plastic and diecast materials, these multicolor cars feature the iconic Denver and Rio Grande corporate roadname. Recommended for collectors and hobbyists aged 17 years and up, this ready-to-go set is designed for three-rail system model railroads. With a grade of C-10 Mint-Brand New, these hopper cars offer a realistic addition to any model railroad layout.