The Hornby R.900 Power & R.902 Circuit Controllers 2-Pack is a set of ready-to-go speed controllers designed for model railways and trains. Made from plastic, these analogue controllers are compatible with DCC control systems and have a wattage of 250W, making them suitable for OO gauge model trains. The set includes two controllers, each providing independent power and control for your model railway layout. Ideal for collectors and enthusiasts looking to enhance their model railway experience.