The K-LINE K101681 Folgers Hopper NIB/C9 # 681 is a pre-built model train freight car made of plastic, designed for O gauge model railroads. Standing at 2 inches tall and with a scale of 1:48, this ready-to-go piece is powered by AC and operates on a three-rail system. The control system for this item is analog, suitable for hobbyists aged 17 and up who enjoy collecting and running model trains from the 1990s.