These are designed to help correct roll center geometry of a car that's been lowered by changing the angle of the control arm via a extended balljoint. This in turn helps reduce the roll couple, and keep the suspension in the effective range of the camber curve, and prevents further wheel compression during cornering. This kit also includes extended tie rods to prevent any bumpsteer issues one might have with extended balljoints. A necessity for those that have lowered or plan to lower their car.