Cockrobin Controls Two Bar Magnets by Hornby are designed for use with train sets in the OO gauge. These bar magnets are a crucial component for controlling the movement of trains on your layout. Perfect for collectors and model railway enthusiasts, these high-quality magnets ensure smooth and precise operation of your locomotives and carriages. Upgrade your Hornby Triang Dublo railway system with these reliable and authentic control devices from the renowned brand, Hornby.