This is our optional 4" rear coil spring that is available for use in our Johnny Joint® TJ/LJ suspension system. This spring is 1/2" taller than our standard spring and is most commonly used in LJ (Unilimited) applications or in heavily loaded TJ applications. This spring may also be used in combination with our CE-9131RH2 spring to address vehicle lean issues. This spring is a dual rate with a combined rate of 79lbs. And a free length of 18.25". Gloss black powder coated finish. If you need help choosing the correct springs for your Jeep - just call the RockJock sales staff!