The Teraflex Coil Springs Front 2-Dr 6in / 4-Dr 4in Lift are engineered so as to provide a great approach to the lifted springs of the Jeep Wrangler. They have an extensive rate of turning and great dynamics balance between the rear and the front load bias and they hence produce great handling on the highway and great performance off road. The coil springs makes use of the linear rate technology that has been preferred for most cars even the jeep. The results of this is very active coils under the load and valving shock. This ensures consistency in the full range of movement in the suspension and also very predictable handling of the jeep when driven off road. In an effort to reduce sagging of the coil and faults of the coil, they have been shop peened. The coil springs come with a lifetime warranty that is limited against defects.