Bass Pro Shops Bearing Protectors provide lasting protection against the damage caused by dirt and water entering into your trailer wheel bearings. Grease maintains correct internal pressure. Stainless steel internal parts housed in triple chrome-plated steel. 2 per package. Sizes: 1.781, 1.980, 2.328. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Bearing Protectors.