The Greaseless HardBall eliminates the need to ever add lubricants to the coupler ar ball. The ball is made of plated steel and the 1/8" thick cap reduces wear and tear on the ball and coupler. The 1/8" nylon cap comes with a lifetime replacment warrenty! Greaseless HardBall never have to lubricate ball or coupler 2-5/16" Plated Steel ball with 1/8" Nylon Cap. Towing capacity: 8,000 lbs. Fits AlumiStinger and all traditional ball mounts with 1" hole. Meets V5 and SAE J684 certifications. Includes wrench flats for easy installation. A lifetime replacment warrenty on nylon cap! Made in the USA