SumoSprings® suspension products are designed to enhance load carrying ability, stabilize sway, and improve overall driver control and ride comfort. SumoSprings® are manufactured in a variety of heights, diameters and densities to support multiple front and rear applications. Made up of micro-cellular urethane providing a smooth and progressive spring rate with superior damping properties. Do not require airlines or compressors Maintenance free 3000 lb. Capacity at 50% Compression | Supersprings International Inc SumoSprings Rear for Ford F-250|F-350