The Lionel O Gauge FasTrack 6-12059 Earthen Bumpers are ready-to-go pre-built components designed for model railroads and trains. Made from a combination of plastic and steel, these gray bumpers are specifically designed for use with the Three-Rail System and AC power type. Perfect for adding realism and safety to your train layout, these analog-controlled bumpers are ideal for O gauge enthusiasts looking to enhance their collection with high-quality accessories.