The HO scale Steel Girder Bridge Black 9" is a pre-built plastic model designed for model railroads and trains. This bridge, measuring 9 inches in length, is suitable for children ages 8 to 100 and can be used by both boys and girls. It is part of the Atlas brand and features a steel girder design in black, perfect for enhancing a model railroad layout. This ready-to-go accessory is perfect for adding a realistic and durable bridge to your train collection.