Leaf Helper Spring SuperSprings; Rear; Self-Adjusting Suspension Stabilizing System; Provides 950 lbs Additional Load Leveling Ability; Do Not Exceed GVWR; Incl. Mounting Kit PN[MTKT]; FEATURES: Sold as a pair left and right Requires no maintenance; Proudly made in the U.S.A. Self Adjusting Suspension Stabilizing System Provides 950 Pounds Additional Load Leveling Ability Reduces Body Roll Up To 30 Pct Without Compromising Ride Quality Works In Conjunction w/Original Equipment Leaf Spring Assembly Adjustable Shackles Allow Installation To Suit Various Needs Typical Installation Completed In Approximately One Hour SAE 51 SuperSprings(R) are a unique and patented self-adjusting suspension stabilizing system for vehicles with rear leaf springs, designed to level loads and reduce body roll. SuperSprings(R) provide users extra load support and reduce body roll without compromising ride quality. They are manufactured using a variety of different sized springs to support multiple applications. All SuperSprings(R) are manufactured in the U.S.A. from SAE5160H high grade, shot peened steel. SuperSprings International Inc, is a manufacturer and distributor of Front SumoSprings and Rear SumoSprings - the world's first airless airbags; SuperSprings - the unique, self adjusting leaf spring suspension enhancers; SuperSway-Stops - the simple solution to reducing camper body-roll; SuperCoils - the heavy duty, replacement front end coil springs; SuperKeys - the forged torsion keys for lifting and leveling the front suspension while maintaining your ride quality.