The product is a set of 4 trailer hub cap grease rubber plugs from the brand RXALASKA. These plugs are designed with a diameter of 1.44 inches and an interior diameter of 1.08 inches, making them suitable for various axle sizes. Made from neoprene material, these plugs are durable and reliable for preventing dirt and debris from entering the trailer hub, ensuring smooth and efficient operation. Ideal for trailer maintenance and replacement, these axle dust caps provide a secure fit and long-lasting performance.