Keep Trains Running Reliably with Bright Boy Improve the conductivity of your tracks by keeping them clean with easy-to-use Walthers Bright Boy. This rubber-based abrasive is also great for taking grime off metal loco, freight or passenger car wheels too.WARNING: This product can expose you to a chemical, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov