These leaf packs offer a large increase in ride quality over the OEM leafs by using a softer but more progressive rate over the OEM leafs. These are a high quality Made In America pack that is custom built to our spec's by Deaver. These packs will make the single largest increase in rear ride quality that can be made with as minimal loss of payload capacity (approx. 10% based on an F-250 platform). Each pack size is designed to sit level with our related front coil springs (2.5", 4.5", and 7") without the use of a rear lift block. For an even BIGGER increase in ride quality, check out our LoCap packs if a loss in payload capacity is not a concern. These packs come as a pair and do not include ubolts or any other items that may be needed depending on installation configuration.