What's Included: The kits contain both front and rear sumosprings sold as a pair (left and right) Weight Capacity: SumoSprings will not increase your vehicle's weight-carrying capacity; these springs have a 500 lb front capacity at 50 Pct compression and 900 lb rear capacity at 50% compression Comfortable Ride: SumoSprings are a patented suspension product designed to enhance load carrying ability, stabilize sway, and improve overall driver control and ride comfort; say goodbye to jarring bumps on the road Easy Maintenance: It is world's only leak proof air spring and it requires no maintenance; handmade from micro-cellular polyurethane and designed to reduce rear-end sag as well as stabilizing weight transfer Vehicle Compatibility: This set fits your 2007-2009 Sprinter 3500, 2007-2021 Freightliner Sprinter 3500 and 2010-2023 Benz Sprinter 3500; Fits 2WD SumoSprings(R) 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(R) 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. SumoSprings are not made from rubber. They are a progressive spring with a very soft initial engagement. That means that as more weight added, the harder they get and more they push back, providing support and control when you need it without affecting the factory ride when unloaded. SumoSprings absorb harsh bumps and jolts for a smooth ride over uneven surfaces, highway joints, and other rough terrain. By reducing harsh movements, SumoSprings give drivers better control of their vehicle, increasing safety and making travel more comfortable. Proudly made in the U.S.A. With a limited lifetime warranty and a 30-day satisfaction guarantee, you can trust that these springs are built to last and will provide the support and comfort you need for years to come.