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This is a replacement set of two Arrma 40mm Rear Shock Springs, intended for use with the Arrma Felony, Infraction and Limitless kits. These high-quality shock springs will allow you to tune your vehicle handling characteristics in seconds. These 38lbf/in (ARA330599) springs are the hard rate, and are available in 27lbf/in (ARA330632), as well as 32lbf/in (ARA330633) rate options.