These HO - scale centering springs are in the #5 style. They're made of metal and fit various couplers, including old - style #3, 5, 9, 20 - Series, 40 - Series, 58, old - style #118, 505, 506, 507, and 508. Each package comes with one dozen springs, offering great value for your model train needs.

Using these centering springs is easy. Just carefully install them in the designated couplers of your HO - scale model trains. Make sure they fit snugly for proper functionality. When handling, be gentle as the springs are delicate. To maintain them, keep them in a dry place to prevent rust. If you notice any signs of wear or damage, it's a good idea to replace the springs. These springs will enhance the performance of your model train couplers and keep your trains running smoothly.