SuperSprings SumoSprings are a patented suspension product designed to enhance load carrying ability, stabilize sway, and improve overall driver control and ride comfort. They are maintenance-free, do not leak air, and do not require airlines or compressors. SumoSprings are manufactured in a variety of heights, diameters, and densities to support multiple front and rear applications. They are manufactured from proprietary closed micro-cellular urethane providing a smooth and progressive spring rate with superior damping properties. Every SumoSpring is handmade with care, making each one unique with its own natural characteristics, such as slight color variations and surface bubbles â proof of the craftsmanship that goes into every piece.• 3000-lb. capacity• 6" dia. x 8.5"H• Weight: 57 lbs. ApplicationsFord F-250 Super Duty 4x2 (1999-2010)Ford F-250 Super Duty 4x4 (1999-2010)Ford F-350 Super Duty 4x2 (1999-2010)Ford F-350 Super Duty 4x4 (1999-2010) Maintenance-free, do not leak air, & do not require airlines Closed micro-cellular urethane provides a smooth & progressive spring rate 3000-lb. capacity | Supersprings International Inc SuperSprings SSR-101-40-2 SumoSprings Rear, Pair