You may have heard the saying that it's the small things that are the most important and when it comes to trailering parts, that's certainly true. The 10-inch 4.2K O-Ring Zinc Rotor may be small but it plays a very important role when it comes to your trailer. Being zinc plated means more efficiency in the rotor and ultimately for your trailer. The zinc is found to remain protective for a longer period of time, which means your brake calipers will last longer and be less susceptible to damage over time. When your calipers are protected, that means no debris, water, or dirt can get inside and cause a loss of brake fluid. You can order the UFP 10-inch 4.2K Zinc Rotor, 5 Stud from SkipperMate Marine using our convenient online ordering. This part also comes with a Bearing Kit and Seal. If you have any questions, don't hesitate to contact us.